This forced turnover of personal wealth constitutes some of the gold supposedly housed at Fort Knox.

“During the 1930s, under President Franklin D. Roosevelt, the US government essentially forced citizens to surrender most of their gold holdings through Executive Order 6102, requiring them to turn in their gold coins, bullion, and certificates to the Federal Reserve in exchange for a fixed price per ounce, effectively "nationalizing" gold; although the government did not actively search for private gold holdings, non-compliance could result in penalties including imprisonment.”

Reminds me a lot of some state’s strategies regarding the Federally legal right to own guns.