I don't know if was the same you have mentioned or another one, but if it wasn't find in the first place, all the possibilities are playing around. For sure in that region doesn't exist any Spanish-Mexican-Jesuit treasure, always from my research.
Peg Leg, Travis grandfather, had many documents/clues of buried caches of suspicious provenance, the most from robberies. All the stolen gold and silver from the Pinal-Queen Valley region, was headed and buried to the north via Hewitt and Whitlow canyons. I believe the most if not all the buried caches of that region, have been found, see then were few people who knew to " read " tracks wery well.