Actually that would be almost three years ago.
From wiki...On March 20, 2013, USA Today reported that Guccifer had successfully hacked the e-mail account of former aide to president Bill Clinton, Sidney Blumenthal.[7] He distributed private memos sent to Secretary of State Hillary Clinton involving recent events in Libya, including the September 11, 2012 Benghazi attack
It was the emails from Blumenthal to Clinton's unauthorized private acct(s) that started the ball rolling.
Hillary has had problems with exposing classified info for much longer. I was going by when Guccifer was interviewed by the FBI in prison. In any case the amount of time the FBI has in the investigation would probably shock many.