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 declare under the penalty of perjury that the foregoing is true and correct. Complete the below for Business Claimants: Print Business Signer Name. 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. The signature on the checks matches all the others check paid on this account and the signature on the Affidavit submitted for the altered check. An affidavit of forgery is an official declaration that a fraudulent act was committed. It should be completed, notarized, and sent to notify institutions.