The Treasury Department reports that more than $8 billion worth savings bonds have matured but have not been cashed. Also, thousands of savings bonds and interest payments are returned to the department as undeliverable every year. Now you can see if any of these bonds or payments are owed to you at Treasury Hunt. While information about every bond is not online, you may be able to find information about your bonds in the database. The site also provides information about lost bonds and transferring savings bonds to HH bonds.