Q: Magic Keyboard and Mouse Travel Hard Case

I wish I could be more original but I find the quality of boxes these items are supplied in are perfectly good.   When I travel, I use the original boxes and they always arrive in good condition.

Not in North America, no.   Are you saying you can be charged duty on used goods.   Your mouse will be paired to the computer and the secure plastic wrapping will be open and cannot be replaced.   Proof enough of use and to add to that pop the receipt in the box ... there is room.