An affidavit of forgery is an official declaration that a fraudulent act was committed. It should be completed, notarized, and sent to notify institutions.I am first duly sworn and state I am: Name. Vendor must complete, sign, and notarize the "Affidavit of Fraudulent Activity" form on the following page. (1) Name of state where the notarization occurred. (2) Name of County where the notarization occurred. The Affidavit of Check Fraud form is used to make a legal claim about the wrongful use of a negotiable instrument. When.