I'm not buying the FBI are there because they need items belonging to Brian to assist in the canine search. One, I feel like they have already gotten what they need for that purpose. If they haven't had that from the beginning, then they definitely should have had from the 17th, you know, when he was reported missing. If not, this entire thing has been botched from the beginning.
Aside from that, didn't LE just pick up something from their porch that Bertolino said was "assist in locating Brian." We all questioned that because of the chain of custody issues. So while today seems like a much more realistic process in terms of procuring evidence, it brings into question, what the #*$(&@(& was that brown package the other day????