From Wikipedia: "He filled the chest with "treasure" containing gold nuggets, rare coins, jewelry and gemstones, along with a jar holding his autobiography. He

From Wikipedia: "He filled the chest with "treasure" containing gold nuggets, rare coins, jewelry and gemstones, along with a jar holding his autobiography. He intended to hide it and end his life nearby, with the treasure as a legacy.[2] However, he survived his illness and waited until he was 79 or 80 to hide the treasure." These are all bearer instruments. You may not know if it's found. 79-80 is 2009-2010. If he had a cellphone, there's a trail for some enterprising telcom worker or NSA analyst to follow (base station->sector->signal strength if not outright location). Presumably he drove there, maybe some ALPR database to mine.