“There’s this strange looking lock behind the driver side door. It looks kind of like one you would see on a vending machine. 1998 Ford Ranger, anybody know what this is for?”
Answer: ATT and other fleets use these to store the keys for the truck. They’re all keyed alike (or in groups). Employees get a key for that, then they can unlock it and it’s a cup that holds the truck keys. It’s cheaper than fleet keying the automobiles.