A Norfolk Superior Court jury ruled this week that 20 antique firearms seized by the Norfolk district attorney’s office 32 years ago do not belong to Myles J. Connor, the notorious art thief, as he has long claimed.

The verdict, his attorney suggested Wednesday, may have to do with Connor’s autobiography entitled “The Art Of The Heist’’ in which he chronicled various thefts he was familiar with in years past.

“In the book he gives accounts of all the things that he burglarized over the years. Against this backdrop, I had to convince the jury that the property belonged to him. He has no receipts,’’ said Michael F. Farrington, who added that Connors took the stand “and explained how he had acquired it’’ through the estate of his maternal grandfather and his mother.

After three hours of deliberations, jurors reached a verdict.

“The verdict was not in Myles’ favor,’’ Farrington said Wednesday. “They were not hospitable at all.’’

Jurors rejected Connor’s claim that he was the actual owner of the weaponry, possibly bringing an end to what Farrington himself considers a “bizarre’’ case that dates back to 1985 when a Norfolk County drug task force raided a Dorchester apartment.

During the trial, Connor took the stand as did his former attorney, Martin Leppo, and a woman who testified that she helped move the items out of the Milton home of Connor’s mother and into the Dorchester apartment prior to the drug raid.

Attorney General Maura Healey’s office, representing the Norfolk district attorney’s office, shared some of Connor’s autobiography as part of its argument that the firearms do not belong to him.

Among the items recovered was the first page of the four-page sheepskin charter for the Massachusetts Bay Colony signed by King Charles I of England, a historic document stolen from the State House on Aug. 8, 1984. (Connor was in prison at the time and could not have conducted the robbery.)

The document has long since been returned to the custody of the state as have other stolen items where the proper owner was identified. The firearms remained in a legal limbo with Connor insisting they were part of his family’s heritage, while law enforcement insisted they were the stolen items that would enrich Connor if they were returned to him.

The current Norfolk district attorney, Michael Morrissey, said in a statement Wednesday that his office will study the verdict and decide what its next step will be in the coming weeks.

“We felt strongly that the plaintiff could not establish a path of ownership to these items, which were comingled with many things that have long since been returned to their rightful owners,’’ Morrissey said. “The ownership of the Massachusetts Bay Colony charter, among other items, was not difficult to establish. The AG did good work coming to a just result in this case.’’

Jeremiah Manion of the Globe staff contributed to this report. John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.