A special report, covering the unreported period to the day preceding the date of any special inventory required by an appropriate TTB officer, shall be made with such inventory. Another report, covering the period from the date of such inventory to the end of the month, shall be made on or before the 20th day following the end of the month in which the inventory was made.

(72 Stat. 1422; 26 U.S.C. 5722)