Each handler receiving almonds for his own account shall tabulate such receipts by varieties and shall submit reports thereof to the Board in such form and at such intervals as the Board may prescribe for all receipts issued by him. Such reports shall be accompanied by duplicate copies of the receipts issued pursuant to the provisions of §981.71 for all almonds included in such report. The Board, after checking such reports in such manner as it deems desirable, shall determine in the manner specified in §981.60 the kernel weight of the almonds so received.