File an Online Complaint. Our Investigation starts with your report.Use our online form to answer a few questions about your issue. Please provide as much detail as you can. Go to USPS website, scroll down to contact, click on 'Email' and then scroll down to 'Personnel' and make the complaint. If you are filling out your Vote-by-Mail ballot and you make a mistake, let us know immediately so that we can send you a replacement ballot. Where I was employed. . County Civil Department, P.O. Box 3406, West Palm Beach, FL 33402. And TTY) or contact USDA through the Federal Relay Service at (800) 877-8339. Do you suggest I file a standard claim with USPS or a missing package claim?