If they were looking for certain documents, as the article states, they had the chance to look at those back in June and presumably knew where they were, what they had, etc. They could’ve easily gone to that location, check the list on the warrant of what they should have looked for grab those and been out of there. No need to rummage around the entire place for nine hours when you supposedly knew exactly what you were going for and where it was.
Crowder, who always puts sources on his website, said the FBI put their own padlock on the room with the documents in June. IOWs, yes, they knew exactly where the documents were.