Each handler who receives walnuts from outside California or the United States shall file with the Board, on CWB Form No. 7, a report of the receipt of such walnuts. The report shall be filed as follows: On or before December 5 for such walnuts received during the period September 1 to November 30; on or before March 5 for such walnuts received during the period December 1 to February 28 (February 29 in a leap year); on or before June 5 for such walnuts received during the period March 1 to May 31; and on or before September 5 for such walnuts received during the period June 1 to August 31. The report shall include the quantity of such walnuts received, the country of origin for such walnuts, and whether such walnuts are inshell or shelled.