The forms can be filled in on the computer. This affidavit is made voluntarily for the purpose of establishing the fact that my signature is a forgery. 7.Do you know who forged your signatures? I got a letter in the mail from Discover asking me to fill out an affavadit regarding the fraud on my account two months ago. An affidavit of forgery is an official declaration that a fraudulent act was committed. It should be completed, notarized, and sent to notify institutions. Client "A" signs an affidavit stating his partner client "B" has forged checks to himself and deposited them into his own private account.