Roman Totenberg's violin, the Ames Stradivarius, 35 years after it was stolen from his office at the Longy School of Music in Cambridge, MA. A woman who'd inherited it from her late ex-husband took it to be appraised, and the appraiser recognized the instrument immediately.
The man from whom she'd inherited it was also Totenberg's suspect as the thief, but in 1980, the authorities, even with a tip from a third party, didn't feel there was enough evidence for a search warrant.
Totenberg, a famed violinist and teacher, died in 2012 at age 101, teaching almost until his last breath.
Read all about it in Michael Cooper's story in the NY Times. (And for the authorities' next trick, could they find the Davidoff Strad, stolen from Erika Morini's apartment when she was dying?)(The violin, not the cello currently played by Yo-Yo Ma.)