California Code, Code of Civil Procedure - CCP § 720.520

(a) The creditor's demand for a third-party claim by the secured party or lienholder, together with a copy of the demand, shall be filed with the levying officer after levy on the personal property but before the levying officer sells the property or pays proceeds of collection to the creditor.

(b) Promptly after the demand and a copy thereof are filed, the levying officer shall personally serve the demand on the secured party or lienholder. Service of the demand on the secured party or lienholder shall be attested by the certificate of the levying officer and the certificate shall be filed in the action promptly after service.

(c) The demand shall be served by the levying officer who levied on the property or by any other levying officer whose office is closer to the place of service. If service is made by another levying officer, such levying officer's costs shall be paid out of the costs prepaid to the levying officer who levied on the property.