Don’t you think they had a crew go into Joe’s abode before they did this last search of Joe’s property? They knew it would look bad if the FBI found something worse than the other locations.
So, before the FBI went through the premises I would suspect they first had a team go through paper-by-paper. Some pages would get removed, some shredded and some went up in smoke.
After going through it all for over two months, it doesn’t really surprise me the FBI found nothing. That was the plan. Indeed, they would have been surprised if they they found so much as one questionable page.
Then again, any lawman would know it was likely a big waste of time to put on the big show for the public. NOTHING HERE TO SEE, NOTHING AT ALL!