California Code, Government Code - GOV § 43741

At the same time the treasurer shall deposit in the post office a copy of the notice, enclosed in a sealed envelope, postage prepaid, addressed to the registered owner of any such bond, warrant, judgment, note or other evidence of indebtedness, registered pursuant to law, whose address appears upon the record in the treasurer's office.  If the bond, warrant, judgment, note, or other evidence of indebtedness is not presented within the time specified in the notice, the interest upon it ceases, and the amount due shall be set aside for the payment when it is presented.