Please complete the enclosed Auction Donor Form and return in the enclosed envelope. Learn how to write effective fundraising letters that inspire more support from donors.Explore best practices and templates in this comprehensive guide. We've also provided free sample donation request forms, letter templates for donation request outreach, and silent auction bid sheet templates. How to fill out the Texas Exes Auction Donation Letter and Form? 1. Provide your name and company information. 2. In this post, I'm breaking down how to write a donation letter. Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS. What to include in donor acknowledgment letters? Texas Department of Transportation.