Not to derail the thread, but as far as jewelry goes, a VERY safe place, if you don’t have a safe-deposit box, is…a pawnshop. Pawn your stuff (make sure you are pawning and not selling of course), mail yourself the ticket, and off you go, secure that your jewels will be waiting and redeemable when you get back and your ticket will be in your pile of mail that the PO is holding for you. There’s a small cost, of course, but it’s very secure. (The pawnshop, anyway. The US mail used to be.)