I am a GC holder currently living abroad with a Reentry Permit. When I got my GC 2 years ago I received my Social Security card as well - all to my US address. Haven't received anything else from the Social Security administration until a couple of weeks ago. 2 weeks ago I was notified that a letter from Social Sec. Admin arrived in my name, but then the letter was lost. I don't claim any benefits and never have, neither have I worked in the US since becoming a PR. I'm not sure what the letter may have been about. Can somebody please give me some idea based on their experience with Social Security Administration? Perhaps I should call them, quote my SSN and ask in case the letter was about something serious?