Jolibee76

Hello all,
Just preparing for my interview. Looking at the standard document checklist they sent out with the appointment letter. I notice they ask "an original IRS 1722 letter if you are applying on the basis of marriage which i am (3yrs). I already sent copies of my 1040 forms for the past 3 years already in my application..I will also bring copies with me to the interview.. however whats is this 1722 letter about? PLus they sent me a a yellow letter months ago requesting documents they only needed was a state or govt issued ID.. nothing else.. i am issuming this is standard checklist brochure they like to send out just to make sure you have everything & to give us applicants are last minute panic!?? Anything else i should be concerned about to bring?
Anyone done there interview in phoenix? If so, how did ya go?
Cheers