Creating a lost note affidavit is an essential process for protecting the legal rights of all involved in a promissory note transaction. In Wells Fargo Bank, N.A. v.Alameda County Trustee Deed Form. Fill in the blank form formatted to comply with all recording and content requirements. Optional, fill in your case notes if desired. b. If the promissory note has been lost or destroyed, a lost note affidavit shall be submitted. b. The applications and forms are available at the front counter of our office.