California Code, Penal Code - PEN § 1269

The taking of bail consists in the acceptance, by a competent court or magistrate, of the undertaking of sufficient bail for the appearance of the defendant, according to the terms of the undertaking, or that the bail will pay to the people of this state a specified sum. Upon filing, the clerk shall enter in the register of actions the date and amounts of such bond and the name or names of the surety or sureties thereon. In the event of the loss or destruction of such bond, such entries so made shall be prima facie evidence of the due execution of such bond as required by law.

Whenever any bail bond has been deposited in any criminal action or proceeding in a municipal or superior court or in any proceeding in habeas corpus in a superior court, and it is made to appear to the satisfaction of the court by affidavit or by testimony in open court that more than three years have elapsed since the exoneration or release of said bail, the court must direct that such bond be destroyed.