It shall be deemed unlawful for any person to alter, change, replace or deface in any way any section or any page of this code in such a manner that the meaning of any phrase or order may be changed or omitted. Replacement pages may be inserted according to the official instructions when so authorized by the city council. The clerk shall see that the replacement pages are properly inserted in the official copies maintained in the office of the clerk. Any person having in his custody an official copy of this code shall make every effort to maintain said code in an up to date and efficient manner. He shall see to the immediate insertion of new or replacement pages when such are delivered to him or made available to him through the office of the city clerk. Said code books, while in actual possession of officials and other interested persons, shall be and remain the property of the city and shall be returned to the office of the clerk when directed so to do by order of the city council. (1980 Code)