Immediately after an appeal inspection is completed, an appeal certificate shall be issued to show that the original inspection was sustained or was not sustained. Such certificate shall supersede any previously issued certificate for the product involved and shall clearly identify the number and date of the superseded certificate. The issuance of the appeal certificate may be withheld until any previously issued certificate and all copies have been returned when such action is deemed necessary to protect the interest of the Government. When the appeal inspection program employee assigns a different class to the lot or determines that a net weight shortage exists, the lot shall be retained pending correction of the labeling or approval of the product disposition by the District Office.