Why do people announce when they find such things. Go on the download, or, if you find a jar of u issued gold coins, melt them down....
Melting down rare gold coins is maybe one of the most spectacular ways to be really, really stupid. Like, galactically stupid. The really valuable numismatic stuff worth perhaps hundreds of thousands is only worth a couple thousand at best in terms of gold. But it gets worse. A coin dealer or anybody else, they don’t pay the going rate for gold if it is an unrecognizeable blob. Might get half that.
It’s hard to ascertain the value of something you’d like to sell without letting the cat out of the bag.