BOSTON (AP) — Art theft experts say now that authorities believe they know who stole $500 million worth of art from a Boston museum, the chances of getting the paintings back are good.

The FBI won't disclose the identities of who it suspects posed as police officers and stole 13 works of art from the Isabella Stewart Gardner Museum in 1990. The works included paintings by Rembrandt, Vermeer and Manet.

Christopher Marinello is a lawyer who recently recovered a Matisse oil painting stolen from a museum in Stockholm in 1987. He says 23 years is not an unusually long period of time when it comes to recovering stolen art.

Marinello says he believes someone will "rat somebody else out" to claim the $5 million reward being offered by the museum.