The RFE could be for anything. I got an RFE last week for my latest I-94 and EAD, even though CIS already has both (considering they issued both, they should at least have a record of them, but hey, we ARE dealing with CIS here). It could be for employment letter, which is quite in vogue these days, or medical, birth certificate, marriage certificate, blah, blah, blah. Who knows, but you'll find out soon enough. At this point, they should start calling it Request for the Same Evidence. Hope it's an easy one.
140/485 RD: 10/01/03
RFE for 485: 10/20/04