List each document that you served. If you need more space, check the box in item 4, complete the Attachment to.Proof of Service of Summons (POS-010) tells the court that you had a summons or other legal papers delivered to (served on) the other party in a case. A proof of service is ultimately what our jobs are all about. It is a document that details your efforts as a process server to find a defendant. Search for various legal forms relevant to Sacramento County. Jessica Ryan Keeney is licensed to practice law in the State of California. The affidavit typically includes detailed information about how and when the service was performed, the identity of the recipient, and other relevant details. Information and forms are available from the Sacramento County Public Law Library. Blank forms may also be available at office supply stores. Requirements.