USCIS TSC
Attention RFE Unit
PO Box 850965
Mesquite, TX 75185-0965
Usually RFE is on two sheet of paper (I guess),
1. on which it instruct to sent them back with that color sheet
2. The requirement of RFE like Medical etc to submit.
I believe ur attorney sent second page, and kept color page so they can reply, that color page is two line page that on top Officer no + issued date, and middle sending back instruction with address, and in bottom CUD (like due date).
I recommend u let ur attorney send this, When attorney send it back with that color sheet on which Officer no is written, that mail is opend in RFE Unit and they send to exactly same officer who is holding ur File, if u reply without that paper it may take time them to figure it out which officer have ur case file
(If u have that paper with officer no u can send urself )
I am glad to see that u receive long waited RFe, and I hope everyhting would be fine.
Wish u good luck friend