An "Affidavit of Forgery" is a notarized, sworn statement, attesting that the signature appearing on it is indeed a forgery. I am first duly sworn and state I am: Name.This affidavit is made voluntarily for the purpose of establishing the fact that my item was altered. (Notary Public in and for the State of Texas or Authorized Officer). Approved: OLD NUMBER. This document is an affidavit used to report issues with a check.