Whats stopping mail carriers from stealing mail?”
The USPIS is primarily an investigative agency comprising of plain-clothes federal criminal investigators entitled “Postal Inspectors” whose primary mission is “to protect the U.S. Postal Service, its employees and its customers from criminal attack, and protect the nation’s mail system from criminal misuse”. It has responsibility for over 700,000 Postal Service employees and billions of pieces of mail transported through air, land, rail and sea world wide a year. These guys have a lot of influence, and they routinely monitor postal employees. In major postal facilities, there is one-way glass walkways behind the postal workers so they can never know when there is an inspector watching them. In short, these guys don’t mess around. It is much more likely that it got lost in the mail, or stolen from a neighbor, than stolen by a postal worker. Check out the link for more info.