Section 7-619. Destroying obsolete documents and records

The register is
  authorized to destroy any or all  chattel  mortgages,  chattel  mortgage
  indices,  certificates  of  stockholders'  consent  to  the execution of
  mortgages  of  chattels,  bills  of  sale,  conditional  bills  of  sale
  affecting  real  property or other filed instruments affecting chattels,
  on file in the register's office after the expiration of five years from
  the date of filing, and any daily index or tickler more than  two  years
  old  and  which  has  been  replaced by permanent block and alphabetical
  indices as provided for in this chapter, and all surplus copies of  land
  maps  of  any of the counties of the city more than ten years old, which
  have not been disposed of by sale or otherwise.