Wow, you’ve gotten into the middle of something very important – to someone else!! This is a disgusting error on the part of Social Security. First thing – if that person’s name and address are on the forms you were sent, IMMEDIATELY forward them to the correct address. Send it by registered mail. And you might want to keep a copy, along with the reg mail receipt. Then, contact Social Security and make them aware that you received the documents in error. You'll have to use the main number: 1-800-772-1213 I know this is all a hassle, but just think how you'd feel if you were fighting SS and didn't have all the information.