The Full Process of Container Inspection Services: What Happens at Each Stage, from Inspecting Empty Containers to Sealing Them with Lead Seals?

Most people in international trade have had this experience: the goods have been inspected at the factory and the compliance report has been obtained, but when the customer unpacks the shipment, they find that two boxes are missing or that a batch of goods with the wrong specifications has been mixed in—and the calls demanding compensation come immediately.

Where's the problem? It's in the container loading process.

inspection of goodsThe first addresses the question of ‘whether this shipment is correct,’ while container supervision addresses the question of ‘whether this correct shipment has been loaded into the container completely, correctly, and safely.’ These are two different matters.

This article aims to clarify one thing: exactly what a container inspector does at the container yard, from start to finish.

What is a monitoring cabinet, and why is it considered the last line of defense before shipment?

Container inspection, also known in the industry as container loading supervision orContainer monitoring...refers to a service in which a third-party representative monitors and supervises the entire container loading process on-site at the factory.

A container supervisor doesn’t sit in the factory office waiting for the workers to finish loading; he has to stand at the container door the entire time, watching as each container is loaded—checking how the cargo is loaded, where it’s placed, whether the quantities are correct, and whether there’s any mixed loading.

This service focuses not on product quality, but on the container loading process. Whether the factory has shipped the correct quantity as specified in the contract, whether goods from different batches or with different specifications have been mixed into the same container, and whether rough handling during loading has caused damage—these are all matters that fall under the scope of container supervision.

Why is this considered the last line of defense? Because once the cargo is loaded into the container and shipped out, if any problems are discovered later, the entire shipment will be adrift at sea, and the losses will have to be borne by the shipper.

The complete process for switchgear services consists of six stages

Below, I will break down each component of the control cabinet in chronological order.

1. Arrive on site and verify the basic information

Container supervisors should contact the factory in advance to confirm the container loading time. They are generally required to arrive on-site before loading begins; they should not show up only after half the cargo has already been loaded.

Upon arrival at the site, the first step is to verify the basic information by comparing the authorization form, PO documents, and packing list you have on hand with the actual situation.

Confirm that the description, specifications, and quantity of the goods being loaded into this container are consistent with the contract.

Verify that the factory address for container loading matches the information provided in the shipment instructions (to prevent the factory from moving the goods to another location for loading).

Verify the container number, seal status, and container type (20GP, 40GP, 40HQ, etc.)

Understand the factory’s container loading procedures—whether they use forklifts or manual handling—to assess the risk of damage later on.

2. Empty container inspection—many people skip this step

Before the cargo is loaded, the container inspector will first conduct an empty container inspection. While this step may seem unnecessary, it is actually crucial. The inspection includes the following:

Is the container clean? Are there any residues, odors, or contamination left over from the previous shipment? (This is especially important for food and textile shipments.)

Is the structure intact? Are there any deformations, rust, or holes in the cabinet walls? Are the door hinges working properly? Is the floor damaged?

Waterproofing: Check for any signs of water leakage at the top and corners. If the cabinets are installed during the plum rain season or rainy season, this inspection directly affects whether the goods will become damp.

Are there any foreign objects? Some factories, to save time, will stuff goods left over from the previous shipment into a corner and mix them in with this shipment.

If any issues are discovered, the container inspector will take photos to document them and notify the client, who will then decide whether to swap the container or continue loading.

3. Supervising the loading process, which is the most time-consuming step

The loading phase is the most time-consuming and patience-testing part of working in the container inspection area. No matter how long the workers take to load the container, the container inspector must not leave.

There are three main tasks to focus on during this phase.

First, count the items by box.Before each outer carton is loaded, the container supervisor records the carton number or batch number, noting each carton as it is loaded—they must not wait until all cartons are loaded to go back and estimate the quantities from memory. Many complaints about “short shipments” stem from factories intentionally underfilling containers during loading; ultimately, the final quantity verification relies on the container supervisor’s on-site records.

Second, inspect the condition of the outer packaging of the goods.When loading each outer carton onto the truck, visually inspect it for any obvious damage, moisture, or deformation, and verify that the markings, carton numbers, product names, and specifications on the packaging match those on the packing list. If you find a carton with mismatched markings, stop the loading immediately and investigate the issue before proceeding.

Third, monitor compliance with container loading procedures.Whether the forklift is loading the cargo in the correct direction, whether the stacking height exceeds the limit, and whether heavy cargo is placed on top of lighter cargo—these are all things that container supervisors must monitor. Much of the damage to cargo during ocean transport stems from rough handling during container loading, rather than collisions during transit.

Here’s a detail from the scene: when loading a full container, the last few rows of cargo near the container door are often the spots where factories are most likely to “tamper” with the load—by leaving out a couple of boxes in that location, it’s hard to notice once the door is closed. The container supervisor must move around inside the container throughout the entire process; they cannot simply stand at the door and watch.

4. Verification of Quantities and Confirmation of Cargo Condition After Unloading

Once all the cargo has been loaded into the container, the container supervisor will conduct a final, comprehensive check.

Tally the number of units installed, compare them with the packing list, and verify that the quantities are correct.

Check whether the cargo inside the container is stacked securely and whether there is a risk of the stacks toppling over or becoming loose.

Check the cabinet for any debris, tools, or other items not related to the bill of lading.

If there are packaging filler requirements (such as air bags or moisture-proof pads), verify that they have been placed as required.

If there is a significant discrepancy between the actual quantity installed and the quantity specified in the order, the supervising clerk will take photographs as evidence and accurately note this in the report; it will then be up to the client to negotiate with the factory.

5. Seal the cabinet with a lead seal—the final step

After confirming that the cargo is in proper condition, the container doors are closed, and the sealing process begins. Sealing may sound simple, but there are specific procedures for each step.

The container inspector witnesses the application of the lead seal on-site and verifies that the seal is secured with a lock provided by the customer or with an official lead seal issued by the shipping line.

Take a clear photo of the seal number, write down the seal number, and verify that it matches the number on the future bill of lading (B/L).

Record the time the container was sealed and file it as the time the goods left the factory.

If the customer requests that their own seals be applied, verify the seal numbers and record them.

This seal number is very important. If, during the unpacking and inspection at the port of destination, the seal number does not match the one on the bill of lading, it indicates that someone tampered with the container during transit, and this container supervision record becomes crucial evidence for the shipper to protect their rights.

6. IssueSwitchgear Report

Once container loading is complete, the container supervisor compiles the full record of the process and issues a container supervision report. The report typically includes:

Container Loading Date, Factory Name, Factory Address

Container Number, Container Type, Seal Number

Comparison of the actual shipment item names, specifications, and quantities with the packing list

Conclusions of the Empty Container Inspection

Abnormalities Discovered During Loading

On-site photos documenting key stages, including empty containers, the loading process, quantity verification, and the application of lead seals

Reports are typically delivered to the client within 24 hours after container loading is complete; some clients require same-day delivery of the report.

Under what circumstances must a monitoring cabinet be installed?

Some exporters ask, “Since the inspection has already been conducted, is container supervision still necessary?” These two procedures address different risks and cannot be used as substitutes for one another. However, container supervision is not required for all shipments; in the following situations, it is recommended that container supervision be made mandatory.

What is the difference between full-container and consolidated shipments?

The key differences between full container load (FCL) and less-than-container load (LCL) container inspections lie in their focus.

For full-container and supervised container shipments, the container supervisor participates in the entire loading process for a single shipment—from inspecting the empty container to applying the lead seals—and the process is relatively straightforward.

Supervising consolidated shipments is somewhat more complex. Cargo is not loaded all at once; it may be delivered to the warehouse in batches and then consolidated by the freight forwarder. Container supervisors must verify the condition and quantity of the cargo when it arrives at the consolidation warehouse, but they are typically unable to monitor the entire consolidation process. In such cases, the focus of the supervisor’s work is on the pre-consolidation warehouse inspection and the post-consolidation shipment confirmation; special attention must also be paid to who applies the lead seals.

AboutInspector OnlineMonitoring Cabinet Services

Yanhuo Online has been providing third-party inspection services in China since 2006. Currently, its container inspection services cover major manufacturing regions such as the Pearl River Delta, the Yangtze River Delta, and Northern China, as well as major overseas manufacturing countries such as Vietnam and India.

Our team has over 2,000 on-site QC personnel across the country and can quickly deploy cabinet inspection staff to the field. We also recommend combining this service withinspection serviceWorking together provides greater protection.

If you are currently looking for a control cabinet service provider, please feel free to contact us for more information.