I expect that before too long, they’ll be telling us that he was also fixated on the National Enquirer, and that was why he he sent the first letter to their headquarters.
Assuming the FBI's conclusion that the stuff originated at Ivins's lab is correct, then Ivins or one of his coworkers must have soaked up the emerging story of the hijackers' stay in the US. I wonder if the National Enquirer connection was public knowledge by the time of the mailing?
The orchestration of leaks, including their vagueness and desperation (and seeming jibing with Duley’s weirdness) tells me the science to be revealed isn’t a dead bang winner.