Philadelphian Joan Langbord and her sons say they found the 10 coins in 2003 in a bank deposit box kept by Langbord's father, Israel Switt, a jeweler who died in 1990. But when they tried to have the haul authenticated by the U.S. Treasury, the feds, um, flipped.

They said the coins were stolen from the U.S. Mint back in 1933, and are the government's property. The Treasury Department seized the coins, and locked them away at Fort Knox. The court battle is set to kick off this week.