Each person, firm, or corporation licensed to operate a cold-storage warehouse shall keep an accurate record of the receipts and withdrawals of food therefrom. The agents of the director of agriculture shall have free access to such records at all times. Each such person, firm, or corporation shall file in the office of the director on or before the sixth day of January, April, July, and October of each year, a report setting forth in itemized form the kind and quantities of food products held in cold storage in such warehouse. The report shall be made on printed forms prepared and supplied by the director. The director may cause such other reports to be filed at such times as he may deem advisable.