A San Francisco treasure hunter dug up a hidden chest of booty after a mysterious group posted a cryptic treasure map online.

The discovery was made less than 12 hours after an unidentified group released a pirate-style map of a "chest worth over $10,000," which could be located using mysterious clues about San Francisco.

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the world's only pirate treasure chest, and one of two surviving 17th-century Jolly Roger flags (that familiar black flag featuring a skull and crossbones). At the center of the museum ...