This article provides a comprehensive sample of an affidavit letter, guiding readers through the essential components and format. CitizenPath has prepared a downloadable I751 affidavit sample that you can forward to friends who are willing to write a letter of support.I have made all of the following attempts listed below to locate this person and to date my efforts have been unsuccessful. To file for an assessment appeal, you must timely complete an Assessment Appeal Application (form BOE-305-AH).