An affidavit of forgery is an official declaration that a fraudulent act was committed. It should be completed, notarized, and sent to notify institutions.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? Write the case Index Number. 5. §170.10 Forgery in the second degree. Client "A" signs an affidavit stating his partner client "B" has forged checks to himself and deposited them into his own private account.