There are a number of advantages to using a cargo seal to that of a padlock regardless of the quality of the padlock. All locks – with the rare exception of a high security locking system – can be compromised through picking. A padlock can also be foreced open quickly using readily available tools. This can be accomplished without any evidence of the break-in.
A lock that has been removed for the purpose of theft can be easily replaced. Padlock are not normally numbered so a driver would not know it had been switched until reaching the final destination. Locks also require key control programs. This leaves room for compromise of the key or combination.
Seals typically cost less than locks, and offer the convenience of a faster and easier removal. This can be especially important during an emergency when the load needs to be opened by first respondeers. It might be vital for safety and security to know if a shipment has been compromised (e.g., pharmaceuticals or food products).
Seal give drivers, security and loading dock personnl a reason to carefully inspect the container and surrounding area. This reduces the overall risk of the shipment.