This seems indicative of a security concern. When this happens it could indicate someone is trying to get a container full of e.g. explosives or chemical weapo

This seems indicative of a security concern. When this happens it could indicate someone is trying to get a container full of e.g. explosives or chemical weapons to be shipped to a target city without a paper trail. Imagine if the malicious container had e-ink screens on the outside that allowed the numbers to be changed on the fly to route the container through multiple untraceable steps. :(