A. You need to submit FS Form 1048, which asks for the bond's face value, issue date, and serial number. You will also need to explain the loss and when you discovered the loss.
If you don't know the serial number, you may provide the exact issue date (month and year) in order for the Treasury Department to conduct a search.
Get the form signed and certified by your bank, and mail it to the Treasury Department. Your replacement bond will be delivered to you electronically.