The ATF Form 3310.12 must be submitted to the National Tracing Center no later than the close of business on the day the multiple sale or other disposition took place. The form may be emailed to multiplelonggunsalesforms@atf.gov, faxed to (800) 578-7223, or mailed to the U.S. Department of Justice, NTC, 244 Needy Road, Martinsburg, WV 25405.