The City Recorder is authorized and directed to prepare blanks in tabulated form, to be filled out in ink by the licensee giving such information as he deems necessary for the ready identification of goods purchased or acquired by the licensee. Each such licensee shall make up a record of all purchases, as determined necessary by the Chief of Police at the time of purchase, upon the forms provided by the City Recorder – and keep them in an orderly manner for a period of two years, open for inspection of and delivery to police officers. Such licensee shall require the seller of merchandise to sign the form reporting the purchase of the merchandise and to affix his address to the form.