On April 12, 2006, numismatist Scott A. Travers bought a pretzel in Times Square and paid for it partly with a 1914 penny worth $350.

In the same week he spent a 1908 penny worth $200 and a 1909 one worth more than $1,000. “I’m planting a seed,” he told the New York Times, “and I hope that a new generation of people will come to appreciate the history that coins represent.”

In the weeks that followed, seven people came forward claiming to have found the $1,000 penny. “The coins were real, but none of them was mine,” Travers said.

In January 2009, the New York Daily News reported that all three of Travers’ coins were still unclaimed. That doesn’t mean they’re still circulating — but they might be.