US Postal Service
Every Post Office has a POST MASTER, who is responsible for everything coming into and leaving his POST OFFICE. He also is responsible for talking to any other POST MASTER at any other POST OFFICE, to resolve issues.
I made sure I meet with our POST MASTER whenever there is a new one and become familiar to him. I ask him questions about how he would handle lost money orders and shipments.
I have had to go to the POST MASTER locally 2 different times over lost USPS money orders. I got my money back 1 time but had to wait 60 days before they would issue a refund. The other time it was money coming to me and the tracking numbers showed it leaving Florida but it never showed it arriving anywhere after that. But at least my POST MASTER investigated and did talk to the POST MASTER on the other end and he did contact me back.