Virginia ? The former head of a Virginia Tech counseling center accidentally packed mental health files of student gunman Seung-Hui Cho along with personal documents when he left his job more than a year before Cho killed 32 people on campus, a lawyer said Thursday.

In a statement to The Associated Press, attorney Ed McNelis said his client, Dr. Robert Miller, placed Cho’s records in a box in February 2006. He said Miller opened it for the first time last week while searching for material that could be relevant to a lawsuit filed by families for two of the slain students in the nation’s worst mass shooting.

McNelis said Miller was surprised to find Cho’s records and he returned them to the center the next morning. The file has not yet been released to the public.

Virginia State Police spokeswoman Corinne Geller said the file contains about eight to 10 pages.