Édouard Manet's Chez Tortoni, ca. 1878–80, is one of the pieces that was stolen from the Isabella Stewart Gardner Museum in Boston in 1990.

Boston’s Gardner Museum Increases Reward for Return of Stolen Artworks to $10 Million

Graham Bowley of the New York Times reports that the board of trustees at Boston’s Isabella Stewart Gardner Museum has increased the reward for the return of thirteen stolen works—by artists such as Édouard Manet, Johannes Vermeer, and Edgar Degas—from $5 million to $10 million. The reward will expire at the end of 2017.

In 1990, the pieces were taken by thieves disguised as police officers. The estimated value of the stolen cache is $500 million, and is considered to be the largest American art heist on record. Steve Kidder, the president of the Gardner Museum’s board, said, “It is our fervent hope that by increasing the reward, our resolve is clear that we want the safe return of the works to their rightful place and back in public view.”

“We encourage anyone with information to contact the museum directly, and we guarantee complete confidentiality,” said Anthony Amore, the museum’s head of security. Amore also went on to state that the thieves have indeed been identified, but it is believed that the works are no longer in their possession. The board hopes that the doubled reward will reveal the whereabouts of the art.