California Code, Government Code - GOV § 26666.2

(a) The applicable form or forms described in Section 26666.10 are present and required sections, if any, are complete.

(b) A case number appears on the summons, order, or other notice. Blank forms, such as responsive forms, are not required to include a case number.

(c) An order to be served, including a restraining order, bears the signature of the judge, including, but not limited to, a stamp or other endorsement or representation of the signature of a judge, certification of a clerk, or court endorsement or seal, and the information on the order materially matches the information regarding the person to be served on the form or forms described in Section 26666.10.