A search warrant affidavit filed Friday stated that investigators wanted to search Cho's e-mail accounts, including the address Blazers5505@hotmail.com. Durzy confirmed Cho used the same blazers5505 handle on eBay.

Virginia State Police spokeswoman Corinne Geller said investigators are "aware of the eBay activity that mirrors" the Hotmail account.

The eBay account demonstrates the prime role computer forensics and other digital information have played in the investigation. Authorities are examining the personal computers found in Cho's dorm room and seeking his cell-phone records.