2005 California Education Code Sections 42661-42662 Article 5. Void Warrants

42661.  Any warrant drawn on the funds of a district retirement
system and issued to the claimant thereof but not presented for
payment to the county treasurer within two years after it was issued
is void and the proceeds of such warrants shall revert to and become
a part of the contributions of the district and shall be applied to
reduce the cost to the taxpayers of the district maintaining the
retirement system.  The county auditor shall each month inform the
county superintendent of schools of warrants which have become void
during the preceding month, and the county superintendent of schools
shall transmit such information to the governing board of the school
district.
42662.  The county superintendent of schools shall keep a record of
all orders, or warrants which have become void.