Freight tampering done with seal intact

Right, you just remove doors with hinges and seal will stay intact. Chicago carries are famous for this practice. Usually it's used for consolidating freight going to West Coast

 

It’s very possible that the shipper gave the driver the paperwork and the seal and no one watched to see if the driver actually sealed the trailer. I know that often happens with my loads. Kinda defeats the purpose, but people are lazy.

 

Spot weld the ends of all bolts on trailer doors, i mean everyone. Then use long heavy duty cable seals

Heavy Duty Cable Lock | Cable Seals | American Casting

Use the cables long enough to weave around door closure rods and through lock assemblies.

The more difficult you make it, the less problems you will have. Thieves look for the easy targets.

 

Tin seals can be removed easily removed and reattached.
They are TIN the little tab will bend to open. Bend it back to reseal

 

Just make sure that you steal something REALLY EXPENSIVE!!

 

If the load is worth the extra expense..

Bolt type seals on both doors and require carrier to take pics of seals on doors prior to leaving shipper.
Not fool proof, but it would put the burden squarely on the motor carrier.

 

I pick up quite a bit of border freight. (southern). Many times there are 2 bolt seals, a long cable seal wrapped around the hinges on both doors, and sometimes "security tape" of some sort bridging both doors. I pick them up pre loaded at our terminals, so I am not sure of the chain of custody at the border. We are required to double check the actual seal numbers with the paperwork, and enter the info on our loaded call on the QC. The OP's situation sounds like it could be an "inside job".....pilfering on the docks. I know.....unthinkable with the boy scouts they have working those docks! Lol