HARTFORD, Conn. – FBI agents Thursday searched the property of a reputed Connecticut mobster suspected of having information about the 1990 robbery of a Boston museum that remains the largest art heist in history.

Agents examined a car in the driveway, searched a wooded area and removed boxes of evidence from the ranch-style suburban home of 75-year-old Robert Gentile, who has been detained since February on federal drug and weapons charges.

An attorney for Gentile, A. Ryan McGuigan, said the FBI returned to his client’s property in Manchester, just outside Hartford, because the agency had a new warrant allowing the use of ground-penetrating radar to look for buried weapons. McGuigan said he believes agents are really looking for stolen paintings but will find no such thing.

“This is nonsense,” McGuigan said. “This is the FBI. Are you trying to tell me they missed something the first time? They’re trying to find $500 million of stolen artwork. … All they’re going to find is night crawlers.”

McGuigan said Thursday afternoon he believes authorities recovered two weapons.

A federal prosecutor said in March the FBI believes Gentile had some involvement with stolen property related to the 1990 heist at Boston’s Isabella Stewart Gardner Museum. Thieves disguised as police officers struck as Boston finished celebrating St. Patrick’s Day, binding two guards before stealing masterworks by Rembrandt, Vermeer, Degas and Manet worth more than $500 million.

Gentile has not been charged in the art robbery and McGuigan says his client does not know anything about it.

Gentile was arrested three months ago on a charge of selling illegally obtained prescription painkillers. Federal agents say they seized three revolvers, numerous rounds of ammunition and home-made silencers during a Feb. 10 search of Gentile’s home.

The museum continues to offer a $5 million, no-questions-asked reward. Gentile’s attorney says that if he were an arch-criminal, he would have figured out a way to get the reward money.