Now, at this late date, you have to pay to get that info. Some of it is little more than raw FBI reports, the very stuff which became impossible to get once the investigation was "stovepiped".
Many of us who work the anthrax threads began to feel that someone inside the FBI at a high position was suppressing the investigation. Turned out that was true ~ FBI Director Robert Mueller was the bad actor. His actions set the anthrax investigation back years.
Now, at this late date, you have to pay to get that info.
That's probably not true. I collected every article I could find about the anthrax attacks and put them on my site. Occasionally, I'd learn about one I'd missed and by looking up key words, I could usually find it somewhere on the Net and then add it to my site.