It remains property of the US gov’t, if indeed it exists.
It doesn’t.
It’s just some treasure hunter nuttery.
Also, the FBI made a search (with the assistance and cooperation of some treasure hunters) and found exactly nothing. Bupkis.
The entire story is nuttery.
If it belongs to the US gov’t, the treasure seeker is for sure on a fool’s errand-if I had enough money to to go digging for treasure that may or may not exist and belonged to someone else, my money would be better spent getting a permit to mine my own property I purchased for gold/whatever else I could find-I think that is what any sensible person would do...