At that scale, I'd bet that selling (even if buying at home) would be obvious to professional traders in the gold market. And quickly hit the headlines. Which

At that scale, I'd bet that selling (even if buying at home) would be obvious to professional traders in the gold market. And quickly hit the headlines. Which is exactly the scenario you'd want to avoid, if you were concerned that a certain President might decide that "your" gold, locked in "his" vault, meant that he had you by the bars.