Interesting that Sandy Berger should be mentioned...he was obviously trying to remove the record of this failure when he stole those documents from the National Archives - for which he was never adequately prosecuted because Bush believed in extending a gentlemanly, professional courtesy and simply never held any Dems responsible for their crimes.
I wonder if something similar is happening here? Perhaps the documents that Broadwell had on her computer (which she says she did not get from Petraeus, but from other sources open to her) are in some way related to the backstory of Benghazi, and this is now being sanitized.