(From FTB.CA.GOV Website)
Registered warrants are now redeemable
Effective September 4, 2009, State of California registered warrants issued by the State Controller are redeemable.
In order to receive any interest earned when you redeem your registered warrant, use the address below to either present the warrant in person or mail it to the State Treasurer's Office.
Attention: Registered Warrant Desk
State Treasurer's Office
915 Capitol Mall
Sacramento, CA 95814
Additional information