5 C.F.R. § 2100.4
Only upon proper identification will any individual be granted access to records which pertain to him/her. Identification is required both for accurate record identification and to avoid disclosing records to unauthorized individuals. Individuals must provide their full name and as much information as possible in order that a proper search for records can be accomplished. Requests made by mail shall be signed by the individual requesting his/her records. Inclusion of a telephone number for the requester is recommended to expedite certain matters. Requesters applying in person must provide an identification with photograph, such as a driver's license, military or annuitant identification card, or any official document as acceptable identification validation. Personal requests can only be accepted on regularly scheduled workdays (Monday through Friday, excluding Federal holidays) between the hours of 7:30 a.m. and 3:30 p.m.
5 C.F.R. § 2100.4