Based on my experience, use a box large enough to put packing material around the hard case. Regardless of actual value, insure it for a minimum of $2500. This will trigger a procedure with UPS that means it gets hand carried through their facilities, and will never be on a conveyor belt.
Thanks for the tip on the insurance. I'll definitely do that one.
Any issues with basicaly building my own box by cutting up other cardboard and taping it all together?
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If there's nothing wrong with having to show an ID to buy a gun, there's nothing wrong with having to show an ID to vote.