I remember my SSN, but no longer have the card. You should be OK, without taking further action. The foreign financial institutions (FFIs) are not required, under FATCA regulations, to actually see your SSN card.
Does my American minor child need a Social Security Number?
As the school year comes to an end, we are faced with lots of things that require new registration for our children. As a victim of identity theft (from my own apartment complex registration) I no longer give our social security numbers to anyone.
Has anyone else who is on a L2 visa had the same problems with there children?? I believe my son need a SSN for registering for Kindergarten and our Tax consultant said our tax returns will be refused as he doesnt have a social number!