Signature. Thank you for your contribution. Kindly return this form to: Development Office.In this post, I'm breaking down how to write a donation letter. This document provides a sample format for a letter acknowledging an in-kind contribution or donation. Bystep guide on how to fill out a Goodwill tax donation receipt. This form is available at our stores in Maine, New Hampshire and Vermont. Fill out the short form below to donate to SEBNC. If you have a desired department you're sending your donation to you can select it below. In this article, we'll cover how to write a donation letter. Use one of our six sample donation request letter templates to get started.