When you purchase or sell gold in the form of bullion coin, can the government obtain a record of this purchase? To provide context for this question, consider the following purely hypothetical case:
A man steadily converts his wealth to gold over a number of years. As he gets on in years, he hands his son an envelope with instructions to tell no one of its existance and to open it only after his death. The man eventually passes on and a will is read. The son inherits a house and a very small amount of cash. No one knows about the envelope. He opens it and finds a series of gps co-ordinates. The co-ordinates lead him to an extremely remote area of the southwestern desert where he finds several large caches of gold.
If he sells the gold, he would be responsible only for income tax? And nothing else. Am I correct?