This article may be of interest: http://www.gold-eagle.com/editorials_04/willis112804.html
http://www.ask.com/wiki/Executive_Order_6102?qsrc=3044
In 1933 approximately 500 tonnes of gold were turned in to the Treasury “voluntarily” at the exchange rate of $20.67 per troy ounce.[8]
8. Time Magazine, Monday, Nov. 27, 1933.
What's more, the Fed Gov retroactively defined how much gold had been in the hands of citizens based on how much the Gov had confiscated. In effect, they created the fantasy that everyone had turned in all their gold and none was left in private hands.