The home of Nassau University Medical Center’s chairman was robbed Wednesday night — but the burglars apparently only stole documents tied to a bombshell FBI probe, The Post has learned. Chairman Matthew Bruderman confirmed his house in Oyster Bay was broken into just two weeks after news broke that he was “cooperating” with the FBI and Department of Justice in an investigation of his claims that the hospital was robbed by state and previous county leaders of more than $1 billion since 2006. The stolen documents were later recovered by Center Island police, who confirmed that an active investigation into...