485-peding ref: ask a employment letter. anyone got same situati

My case which is 485-peding based on 140 approved (NIW) has become current. Last weekend, I received a ref from CSC which asks me to show an employment letter. Actually, I submitted it when I filed 485 in Dec 2004. In ref, it says the purpose of that evidence is to sure you are not likely to become a public charge. I’d like to ask if anyone would have a same situation before? Or what’s the outcome for that kind of ref in 485? Thanks for share!