Do you have any tricks that let me send 10 bucks in a gift card with out it being stolen?
I always send checks.
Classically the only postal employee who gets away with stealing FIRST CLASS MAIL is the one who steals only one piece. By the time they get to three pieces the Inspectors will have triangulated the event and will be watching him steal it.
Postal facilities have enclosed soundproof observation galleries throughout ~ something outsiders are not usually aware of. At any moment you could be scratching your crotch and there's an inspector in a nearby breakout door watching through the one-way glass.
Every year there are one to a half dozen carriers get caught dumping mail in a sewer or stuffing it in their basements at home. Very rarely do you hear of a postmaster or official being involved in mail depredation.
If your mailbox is out on the street you are asked to report depredations FIRST to the local police authority. Frequently "they know something".