The best news in the world for a Northern California couple may turn out to be the worst news in the world. The couple made an incredible find on their property when they were walking their dog; it was over $10 million in gold coins. A find of rare coins that is considered the greatest find in U.S. history, one the couple thought would bring them untold fortune. Not so fast.

After a little digging by the San Francisco Chronicle, the coins may have been stolen from the U.S. mint making it the property on the United States government. According to historian Jack Trout, the coins are mostly uncirculated and in mint condition and those two facts match the gold heist in 1900 of the San Francisco mint. If the coins were stolen from the U.S. mint, the couple would be entitled to a finder’s fee but may not be able to keep their find.

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