It was said here that Walter Larson had worked at the Mint, whichever one that was, then ripped it off. But the U.S. Mint, those in San Francisco, Philadelphia, West Point and Denver (the one in D.C. does not mint coins) is only responsible for coinage, not banknotes - that privilege belongs to the U.S. Bureau of Engraving and Printing. Both are of course Branches of the United States Department of the Treasury, and investigation into counterfeiting and theft of money from them would be carried out by the United States Secret Service, meaning that this organisation protects both dead and living presidents.