A driver pulls up to the chassis, hooks up, and grabs the container without ever looking at the door. Twenty minutes later dispatch gets a call: the seal number on the delivery order doesn't match what's on the box. Now the driver, the carrier, and the terminal are all arguing about who's responsible for a shortage claim that might not even be real. One 15-second check at pickup would have settled it before the truck left the yard.
Why the Seal Is Your First Defense
A drayage driver is the last link in the chain before a container reaches the warehouse. Whatever condition the box is in when the driver leaves the terminal becomes the driver's problem if nobody wrote it down. The seal is the one piece of evidence that proves the container wasn't opened between the terminal and the delivery dock.
CBP treats seal integrity as a security issue, not paperwork trivia. Container Security Initiative rules and C-TPAT minimum security criteria both assume the seal stays intact from the moment it's applied until an authorized party breaks it. A driver who skips the seal check is skipping the one control that protects everyone downstream from a smuggling or pilferage problem.
What a Compliant Seal Looks Like
Ocean containers moving through Port Miami and Port Everglades need a high-security seal that meets ISO 17712. That standard sorts seals into three classes, and one of them belongs on a loaded import or export box.
If a container shows up on a chassis with a padlock, a plastic strap seal, or anything that isn't a stamped bolt or cable seal, that's a red flag before you even get to the number.
The Check at Pickup
Before hooking up and rolling out of the terminal, walk the container and confirm three things match: the container number stenciled on the door, the seal number on the bolt or cable, and the seal number printed on the delivery order or Equipment Interchange Receipt. All three need to line up before the truck leaves the gate.
- Confirm the container number matches the paperwork, not just the seal
- Confirm the seal sits in the right-hand door handle, seated all the way
- Confirm the seal number is legible and matches the EIR, digit for digit
- Take a photo of the seal and container number together before departure
Reading the Seal Number Right
Bolt seal numbers get stamped small, and Miami sun fades ink fast. A "0" can look like an "8" from three feet away in bad light. Get close, use a phone flashlight if the yard lighting is weak, and read every character out loud against the paperwork rather than eyeballing it for a general match. A single transposed digit on the EIR creates the exact same headache as a real tampered seal, just with an easier fix if it's caught at the gate instead of at the warehouse.
Signs of Tampering
What to Do If Something Is Off
Stop before you hook up. Don't pull the container out of the terminal on the assumption you'll sort it out later. Call dispatch, note the discrepancy, and let the terminal gate clerk log the condition before the box leaves their custody. Terminals run a process for exception pickups built for this exact situation. Using it protects the driver and the carrier from a claim for damage or loss that happened before the truck arrived.
If the seal is missing, treat it as a hold, not a pickup. A driver who takes an unsealed loaded container off the yard is accepting responsibility for whatever is or isn't inside it.
Documenting the Seal Before You Roll
A photo takes five seconds and settles disputes that would otherwise take days. Get the container number and the seal in the same frame, readable, with a timestamp. Attach it to the load in the carrier's tracking system or send it to dispatch before you roll. On export moves where the driver's own seal gets applied at the shipper's dock, record that seal number on the bill of lading or shipping instructions before leaving the facility, not from memory at the end of the day.
Who Eats the Claim
When cargo shows up short or damaged, the first question is who had custody last. A drayage carrier that picked up a container with a documented, verified seal and delivered it with that same seal intact has a clean chain of custody. A carrier that can't produce a seal record at pickup is the easiest party to point at, whether or not the loss happened on their watch.
That's the whole reason the check matters. It's not about slowing down the pickup. It's about making sure the driver who did nothing wrong doesn't get stuck paying for someone else's mistake three warehouses down the line.