This happened to us too. We decided to mail new packet asap same week cos we weren't sure if they were gonna mail it back. But guess what.... we received the packet back with a paper from them in top of the packet.
So depending on the time you have you can wait to receive it and remail same packet with the paper or just mail another with money order or check.
Please I have a quick question which I couldn't find answer to via Google. I am wondering for a k2 aos, do they get 2 years conditional pr or something else after approval for main applicant (k1) aos.
Thank you.