FBI says it knows identity of Gardner art thieves Names not divulged; trail of Gardner masterworks ended with a sale try a decade ago; investigators cite progress, seek help in cracking 1990 case ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Dina Rudick/Globe Staff Richard Deslauriers of the FBI said Monday that the agency has identified the thieves in the 1990 Gardner Museum heist. Dina Rudick/Globe Staff “I think we’re all optimistic that one day soon the paintings would be returned to their rightful place,” US Attorney Carmen Ortiz said. John Tlumacki/Globe Staff/File 1996 There is a $5 million reward offered in the case for information leading to the recovery of the items in good condition. File photos Clockwise from left, “The storm on the Sea of Galilee” by Rembrandt, “Chez Tortoni” by Manet, and “La sortie de pesage” by Edgar Degas. Matthew Cavanaugh for The Boston Globe Now 46 and living in Vermont, Richard Abath worked as a guard at the Isabella Stewart Gardner Museum when it was robbed in 1990. Jonathan Wiggs/Globe File Authorities searched the Connecticut home of reputed mobster Robert Gentile in May 2012, but did not find the artworks.