Originally Posted by Flying Lawyer
Read the instructions and sent that stub to the relevant agency OR if you go back to the US within the validity of your "visa" : nothing and be happy that you do not have to complete that green card on your next arrival. I travel back and forth a lot and I only fill the green form once in three months.
So do you keep the stub? I mean I travel to the US about 1-2 times per month and I'd love to avoid the paperwork. Is this official?