In a bizarre twist to a 15-year-old mystery, two Boston FBI agents are in Paris this week probing whether an indicted French media mogul knows the whereabouts of art heisted from the Isabella Stewart Gardner Museum in March 1990, the Herald has learned. According to an American art dealer and historian, the agents want access to French legal records surrounding the arrest of Jean-Marie Messier, the embattled former CEO of the entertainment conglomerate Vivendi-Universal. The art expert, who spoke on condition of anonymity, was present for six hours on Tuesday when the FBI agents and a French prosecutor discussed whether...