There is a recent question in the close-votes queue that is asking about how to deal with a customs issue for a package that was shipped to the OP, rather than one the OP attempted to bring through customs while traveling.
On one hand, I'm inclined to agree with the close votes on the grounds that the question isn't related to travel at all. On the other hand, the on-topic page suggests that customs questions are explicitly on-topic:
customs & border crossing, visas and other travel documents such as permits
Additionally, since travelers do frequently have to deal with customs, the argument could be made that the community here would likely be at least somewhat well-suited to answer these questions.
Do we want to allow non-travel customs questions here or only questions regarding dealing with customs while traveling?