Check the topo map. You put this in Nevada, miles away from any Boise mountains. Good job otherwise.
Oops. It was only 4 degrees of latitude off. No big deal. Thanks for the catch.
Were you able to find the register while up there? It was well hidden and we discovered it almost by accident. I started getting rid of some extra rocks and lo and behold, they were covering the register. I'm sure many people never find it.