I think it is much more likely that the FBI planted the classified docs on that computer. The stench of cover-up is all over this investigation.
Benghazi was a non-story to the MSM and now they are consumed with the cover-up part. This thing has more legs than a centipede.
They kept Banghazi under wraps to get Obama back into the WH. Now that the deal is done, Petraeus resigns to keep himself from having to testify and the MSM will keep trumpeting the Petraeus infidelity story. Once they find out (as if they don't already know) the real story behind Benghazi and all the arms that were shipped to Syria and the Muslim Brotherhood...they'll get amnesia again to protect this current administration.
It was announced today for example that the FBI has spent more time in this Broadwell's apartment than they have invetsigating the consulate facility in Benghazi.