No one. It was left open and in ruins for anyone to go through. In fact a reporter (ABC? NBC? CBS?) did go in and find documents on the ground. The FBI didn't get there for two or more weeks.
How did the attack END ?
Ty Woods and his team drove them off and it seems the attackers followed them back to the CIA annex to link up with other jihadis and continue the attack there.
Stevens was found four or five hours after Woods' team had come and gone.
CNN just happened upon Steven’s diary when they thought it was going to be a kidnapping. Just like they secured a reporting base from Saddam Hussein to trash W.