Hmm, around my neck of the woods people aren't allowed to bury a geocache. We only do hides, not buried objects. But maybe that's not universal, I don't know. There are a lot of treasure searches out there, though. We used to do t-hunts with ham radio clubs, where you triangulate a signal to locate a transmitter. There's also letterboxing and probably local stuff that goes on all the time. Did you see people go to that same spot, Desert Rose, or was it just this one guy? It makes you wonder.