Employers are required to maintain I-9 records even if not maintained by USCIS.
Employers must maintain I-9 records for employees for at least 3 years or 1 year from the date of termination whichever is greater. In April 2017, USCIS will dispose of transaction records that are over 10 years old; dated on or before Dec. 31, 2006.
Download Historic Records Reports by March 31, 2017. E-Verify employers may download Historic Records Report that contain transaction records dated on or before Dec. 31, 2006 now through March 31, 2017. E-Verify encourages users to record the E-Verify case verification number on the relating Form I-9, Employment Eligibility Verification, and to retain the Historic Records Report with Form I-9.