Quote Quoting budwad
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You take all the documents you have and go to the nearest Social Security Adm. office.

https://faq.ssa.gov/link/portal/3401...ty-number-card
I cannot emphasize this enough...stop trying to do this by mail and do it in person at the nearest SSA office. Yes, its a pain in the butt but you won't risk your documents getting lost again.