Request a Tax Donation Letter. Please fill out the following form to obtain a letter.If you must file Form 8283, you must complete either Section A or Section B depending on the type of property donated and the amount claimed as a deduction. Donation Request San Diego Global PO BOX 120551. San Diego, CA 92112-0551. 3. All donations must be picked up at Petco Park. We regret that we cannot ship donations. To submit a donation request, please review our guidelines and instructions below. To help you better understand the tax obligations specific to nonprofit organizations we have created this guide. How to Use This Guide.