This form is filed with the Court after the service is done. This form is called an Affidavit of Service.The affidavit of service must state the date, place, and time when the papers were served, and include a description of the person served. An affidavit of service, also sometimes called a proof of service affidavit, is a type of affidavit that relates to legal documents that are filed with a court. Certificate of Service.