Italian officials are said to have pictures of antiquities being pulled from the ground that they say is documentary proof that Boston’s Museum of Fine Art has stolen art. “It is the smoking gun. It means they came out of the ground; they were looted and cleaned up and sold. That’s about as strong a case as you’re going to find.” MFA officials said yesterday they have yet to hear from Italian authorities. The museum has long disputed that works in its collection were stolen, an assertion underscored yesterday.”