Affidavit of Forgery. An affidavit of forgery is an official declaration that a fraudulent act was committed.It should be completed, notarized, and sent to notify institutions. The Affidavit of Check Fraud form is used to make a legal claim about the wrongful use of a negotiable instrument. When. This manual will contain Best Practice recommendations based on industry standards. Instructions on how to complete the "Forged Endorsement Affidavit". Fill out the attached ADOT Sonoran Desert Tortoise Observation Form and submit to the ADOT Biology. This affidavit is made voluntarily for the purpose of establishing the fact that my signature is a forgery. 8.