Is Fort Knox empty?

asks one of my advisory newsletters. The question arises because:

1. There has been no audit of Fort Knox since 1974;
2. Attempts to secure an audit are rebuffed or answered by a list of what is supposed to be there;
3. The US shipped $1B worth of gold this year to somewhere in S Africa; Coal to White Castle?
4. The rumor is that US gold is shipped to China as collateral for Treasuries and the weak Dollar.

Hundreds of tons of gold were used in the schemes to suppress the gold price. Where from?