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They will take away courtesy copy or original copy which ever you present it to them, EAD, AP, I94\'s. Take two pic\'s (ADIT style) with you.
Your passport will be stamped one year temp GC and they will take finger print and signature once again in a form.
I submitted courtesy copy and retained original copy with me. You better ask your attorney to give the original copy because its your GC process and what he has to do with it.