Ok, so this bit makes sense, if you are spending lots of dollars on these items especially coming from overseas and they get stopped at customs you have a permit and the item will be allowed through.
Having said that the only way an item could be picked up is if it is in gun mode, which MP is not, unless there was one released and I'm not aware, but this isn't to say they won't release him in the future like this.
Obviously older (and reissue) Megs, Brownings etc are in gun mode when packaged so it makes sense to cover yourself as to not lose the money spent on these items.