Every licensee hereunder shall at all times keep and maintain records of the time of his purchase, acquisition or receipt of junk; a full and complete description, including trade names, serial or manufacturer's numbers, if any, of every article or item of junk purchased, acquired or received by him; the date and approximate hour of such purchase, acquisition or receipt; and the name and address of the person from whom such articles or items of junk were purchased, acquired or received. Such written records shall at all times be subject to the inspection of the Borough. Such records shall be retained for a period of five years.