In the desert around Las Vegas me and my four wheeling buddy found all kinds of normal finds. There are all kinds of mine shafts, without going in any we would walk around them. You could find old tools, their old dumps with cool old glass bottles and old cans, some you could read the label still. We never took anything, left them for the next person to discover. We always said if we every found anything of value or historic we would give it to the University. We never did tho.
Not Jeep related finds, but a friend of mine worked at a Houseboat rental place, and the things people leave behind, even famous people. She found a tape of Tommy Lee and Pamala Anderson, I'm sure they left it to be found. People would come out for a week on the lake and buy things just for the trip, then leave them. Fishing poles and tackle, Inflatables that you pull behind boats, all kinds of stuff they did not have room to take back with them.