It's a case that combines history and mystery--and very valuable gold coins. The stakes were certainly high: One of these rare $20 pieces sold for a record $7.59 million in 2002. Here's the story. A jury decided that a Philadelphia woman, Joan Langbord, who found the coins in her father's bank deposit box, never should have owned them, and that the U.S. government was right to take them back. The government argued that the never-circulated gold coins should never have been anywhere outside the U.S. Mint. Only a half-million of the coins were made. The rare "double eagle" coins, designed...