For example, I sent a registered, overnight USPS package to another member of this forum which contained a cashier's check for a gun. It never arrived. The local post office acknowledged they received it but didn't show any record of what happened to it after that. They basically shrugged and said there was nothing they could do. Several months later it arrived at the intended destination, torn and water logged. Had that package contained a gun or anything of value it would have been ruined.