These two coins should have been the only 1933 double eagle coins in existence. However, unknown to the mint, a number of the coins (20 have been recovered so far) were stolen, possibly by the U.S. Mint cashier, and found their way via Philadelphia jeweler Israel Switt into the hands of collectors. The coins circulated among collectors for several years before the Secret Service became aware of their existence. The matter came to the attention of mint officials when an investigative reporter looked into the history of the coins he had spotted in an upcoming Stack's Bowers coin auction and contacted the Mint as part of his research. As a result, an official investigation into the matter was launched by the Secret Service in March 1944. Prior to the investigation, a Texas dealer sold one of the coins to a foreign buyer, and it left the U.S. on February 29, 1944.