This article and video will show Notaries to fill out each part of a notarial certificate, and common mistakes to avoid. For notaries commissioned or recommissioned on and after January 1, 2016, the seal must also contain the notary public's Secretary of State ID number.You should contact your state Notary regulating agency to report that your certificate has been lost and request instructions for obtaining a replacement. When notarizing an affidavit, make sure the signer appears before you in person. (name of attorney-in-fact) as attorney-in-fact on behalf of ______ (name of principal). As a notary your only duty is to perform the notarial act and complete the notarial certificate. (You may, however, show the signer a certificate.) Given under my hand and seal of office this ______ day of ______, 20___. (seal). Notary Public Signature. If someone buys the lost certificate unknowingly, it may be impossible to cancel it and get a replacement, resulting in a permanent loss of your investment. 3.