All reports required to be filed under the provisions of this article shall be made on blanks, furnished by the department, which shall contain the following certificate: “I hereby certify under oath that I am duly authorized to make this tax return; that the information herein contained is true and correct and same is shown by the records of the identified producer; and that the amount of taxes accompanying this return is the true and correct amount of taxes due the State of Alabama by this producer.” The same must be duly verified.