Has the FBI shared what info the garnered in the Trenton PO's roped off area with the Postal Inspectors or the NJ State Police -- or is it still just the summary statement?
No one knows why they dug up the boxes when all they had to do was use cotton swabs to pull samples, then spray them out with bleach to make them safe pending results.
Contamination in various postal facilities was found by special bio-hazard companies under contract to the USPS!
Top postal managers have publicly stated that the FBI did not communicate its findings to the USPS.
This sort of behavior is, unfortunately, typical of the FBI.
The official report (of the NJ Dept of Health, as I recall, which was coordinating this part of the investigation) says that no anthrax was found in any mail drop or any receptacle in which mail was placed. Preliminary reports of such contamination proved incorrect. Anthrax was only found in those parts of postal facilities used for mail in transit. (This is in contrast with Boca Raton.)
Muawiyah's theory that all the anthrax letters were mailed from Boca Raton is strange, but I'm leaving open the possibility that something like that is the truth. They've searched the mailboxes in the Trenton area exhaustively and found nothing; it's hard to explain that.