How are they going to know where it is?
There’s no mandatory reporting of gold sales.
If you have physical possession of the gold, and paid in raw cash for it (no check, card, or anything else) you may be able to hold on to it.
But not spend it. Look how it played out in Argentina. Gold can make you a dead man very quickly once things head south.
Showing up to pay for something with a gold coin means the mob will show up to take it from you very quickly.