"We are analyzing them and we will act on those as appropriate," he said. "The goal is not to generate the largest number of tips, but to generate the best tips that will lead us to the art."
Richard DesLauriers, an FBI agent in Boston, said investigators believe the thieves belonged to a criminal organization based in New England and the mid-Atlantic states. They believe the art was taken to Connecticut and the Philadelphia region in the years after the theft and offered for sale in Philadelphia a decade ago. After that, the FBI does not know what happened to the artwork, DeLauriers said.
Empty frames still hang on the walls of the museum as a reminder of the loss of precious works of art, including "The Concert" by Johannes Vermeer and several Rembrandts, "A Lady and Gentleman in Black" and "Storm on the Sea of Galilee," his only seascape.
The statute of limitations has expired on crimes associated with the actual theft. But prosecutors say anyone who knowingly possesses or conceals the stolen art could still face charges.