Mental health does certainly come into postal thefts. Most of the cases I have seen reported run to carriers who got behind, put some items aside for the next day, which was just as busy, put some aside for later delivery.... ;and when the inspectors arrive the back bedroom is full of envelopes past the windowsills.
I have several different accounts and several different address labels. They all have the same address. Perhaps changing the design of your address labels? For example, since you are selling coins and paper money, use a design that would "read " as feminine and flakey-- perhaps flowers and a Live Laugh Love motto as well as the address. Or one that 'reads" grandparent /child with Tommy the Tank Engine.
Move to a generic box- about the size of a chocolate box.
Change the post office or post box you ship from. If these are arriving damaged and with USPS markings, the theft is close to home, not a thousand miles away.
And of course, Cookie Jar Insurance. Adding a small amount, less than a dime, to your asking price or shipping price to cover a self-insurance premium. All those virtual dimes go in a Virtual Cookie Jar to cover losses of any kind, including return shipping labels, damage or loss in transit, flakey buyers and that time you sent the $50 bill instead of the $25 bill.
