“The Isabella Stewart Gardner Museum … doubled the reward to $10 million last May, but said at the time it would revert back to $5 million on Jan. 1 if no one came forward to collect the windfall before then. When announcing the increased reward with an expiration date, museum officials said they hoped it would send an urgent message to anyone withholding information about the artwork’s whereabouts and dispel any doubts about their intention to pay it.” That tactic didn’t work, and so the offer has been extended indefinitely.