“In August 2008 (seven years after the attack), Department of Justice and FBI officials announced a breakthrough in the case and released documents and information showing that charges were about to be brought against Dr. Bruce Ivins, who took his own life before those charges could be filed.”
(Aside: Robert Mueller was the then-head of the FBI.)

I wasn't aware that they'd ID'd anybody. As I recall, the findings that the anthrax came from Fort Detrick fairly early on. (If memory serves, which it sometimes doesn't.) I remember thinking how odd it was that that finding didn't get more attention on the media. It was just a non story. But the anthrax itself was a huge story, very sensational.

Then the findings that it was produced by our own military? Not a blip.