WASHINGTON  A judge unsealed a new batch of court documents in the anthrax case on Wednesday, filling in further details of the bizarre behavior of Bruce E. Ivins, the Army scientist who the F.B.I. has said carried out the letter attacks of 2001.

Last September, according to a sworn statement from an F.B.I. agent, Dr. Ivins sent himself an exuberant e-mail message under the heading “Finally! I know Who mailed the anthrax!” He did not identify the perpetrator but said he was close to assembling the final proof.

“I’m not looking forward to everybody getting dragged through the mud, but at least it will all be over,” Dr. Ivins wrote, adding, “I should have been a private eye!!!!” and signing the message “Bruce.”

The documents do not speculate about his motive, though Dr. Ivins was aware by that time that he was under suspicion and might have believed that his e-mail  he maintained at least eight e-mail addresses  was being monitored.