I need to authenticate again an employee's work...

I need to authenticate again an employee's work authorization for Section {3} of the I-9 Form. The employee's {insert document type} will no longer be valid after {insert expiration date}, and they have submitted {insert other document type} to prove their continued eligibility for employment. Can you provide me with instructions on the re-verification process, including the steps to complete the re-verification section of the I-9 Form and the list of acceptable documents?