Now that you mention it there were depot rumors of weapons caches. Even that some were buried in the area.We also know that state had 40 million for Stevens to buy back weapons that got into the wrong hands.
I hate not knowing hate surmising after reading two hundred links,sure would be nice if someone in the know would testify.
In the House hearing, one of the witness, I forget his name said there were 10-20 thousand surface to air missiles missing. Qaddafi had quite a mass of weaponry, I have read that before he was killed there was concern that he might use mustard gas and other chemical weapons. http://www.washingtonpost.com/world/gaddafi-could-turn-to-libyas-mustard-gas-stockpile-some-officials-fear/2011/03/16/ABT9iEt_story.html Somebody took control of those weapons when Qaddafi was killed.
I do not remember which mouth said it but one of the excuses given for NOT helping the Americans in Benghazi was concern for civilian deaths. I seriously doubt we in the near future will be told the exact reason why Obama refused to send help.