Important: The person alleging forgery must complete this form in longhand. I swear or affirm under penalty of perjury the above stated facts are true and correct to the best of my knowledge.Forward all three copies to the address noted. 2. PRINT or TYPE all matter entered on this form. 3. 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 signature? The person alleging forgery must complete this form in longhand. Suffolk County Estate Tax Affidavit Form. Fill in the blank form formatted to comply with all recording and content requirements.