Cal. Penal Code § 34010

Any law enforcement agency that retains custody of any firearm pursuant to Section 34005, or that destroys a firearm pursuant to Sections 18000 and 18005, shall notify the Department of Justice, and, if applicable, the superior court and any parties to any civil or criminal action related to the firearm, of the retention or destruction. This notification shall consist of a complete description of each firearm, including the name of the manufacturer or brand name, model, caliber, and serial number.