A simple donation letter sample can start with, "You've been a big part of our organization's fabric over the years. I've attached a voided check from the account I would like to use.Follow the two-step process below to guide the selection. Step 2 – Complete Donation Form: Download and fill out the stock donation form. Be sure to enter the percentage designation of the donation where indicated. If you are completing the form for yourself, please complete pages 1, 3 through 9, 10 (if applicable), and 15, initialing and signing where indicated. All donations must be picked up at Petco Park. We regret that we cannot ship donations. Let's walk through common examples of donation letters, starting with a template of the basic format to follow. Our packages can be customized to create segments within a single appeal mailing, variations on letters, gift amounts and imagery.