This reminds me of the treasure supposedly hidden in the American Southwest by Forrest Fenn. He says it's still out there and has not yet been found. https://en.wikipedia.org/wiki/Fenn_treasure
Hmm, I think this clue is new since I last read about this: In January 2015, Fenn revealed in a new interview: "I know the treasure chest is wet." Maybe this means he recently visited the treasure site? Maybe it's worth it to surveil him in case he goes again.
