Hmmm, I plan to be in Wyoming for a few days - starting late next week. Mostly I want to revisit Laramie since I haven't been there since I was 16 (over 40 years ago). I imagine it's changed considerably.
If you want to know about hidden caches in Wyoming, get yourself some books - Thomas P. Terry's
US Treasure Atlas, Vol. 10 and Thomas Penfield's
A Guide to Treasure in Montana and Wyoming. Those two books will give you enough ideas to last a lifetime.
Here's one example from the Terry book, page 1118: "253A. In the late 1800's, Ella "Cattle Kate" Watson and Jim Averill accumulated a large sum of money from stolen cattle transactions. Averill built a plank shanty saloon with a corral out back to hold their stolen cattle. He then built a cabin about 1 mile from the saloon, both structures located near the old Bothwell Ranch in Sweetwater Valley. Between $10,000 - $50,000 in profits from their illicit dealings was buried somewhere near the cabin. In 1899, 6 men stormed the house and demanded their stolen cattle or gold coins in payment for damages. When they refused to cooperate, the irate ranchers strung them up and the treasure went unrecovered. The gold coins, buried in several separate caches, remain buried 15 miles W of Alcova."