Section 912.   Delivery of books, papers, etc., to successors.
   All papers, books, documents, records, archives and other properties prepared for or purchased by the city shall be and remain the property of the city.
   All officers, department heads, boards, commissions, and employees, upon leaving office, shall deliver to their successors all such papers, documents, records, books, archives and other such properties pertaining and belonging to their respective offices or department in their possession or under their control.