Upon receipt of an incomplete or improperly executed application on ATF form 7 (5310.12), or ATF Form 8 (5310.11) Part II, the applicant shall be notified of the deficiency in the application. If the application is not corrected and returned within 30 days following the date of notification, the application shall be considered as having been abandoned and the license fee returned.
27 C.F.R. §478.59