WASHINGTON—The FBI found a trash bag of shredded documents, thousands of dollars in cash, latex gloves and a “go-bag” when they searched the home of a Maryland couple accused of trying to sell information about nuclear-powered warships to a foreign country, an agent testified Wednesday. Jonathan Toebbe, a Navy nuclear engineer, and his wife, Diana, were arrested in West Virginia this month on espionage charges. Prosecutors allege that Jonathan Toebbe tried to pass secrets about sophisticated and expensive Virginia-class submarines to someone he thought was a representative of a foreign government but who was actually an undercover FBI agent. The government accuses Diana Toebbe of serving as a lookout for her husband at several “dead drop” locations at which sensitive information was left behind. The couple pleaded not guilty in federal court in Martinsburg, West Virginia. They face life in prison if convicted. The Toebbes have been jailed since their arrests. The country to which Toebbe …