EB3RIR,
I am assuming your case was done by the book so this may be good news. At least your file is moving. Have you called and ask if your case has been assigned to an officer? If it has been and it is adjudicated positively within a few months, consider yourself truly blessed!
I'd like to gauge the opinion of other users. If you are from an SR impacted country and receive and RFE for the I485 application (sorry about the TLAs - three letter acronyms!) that's for employment or something else, should you also send proof of special registration? I would think yes since BCIS is likely to ask you at some point anyways. The only disadvantage I see is sending additional information may cause some delay.
rgds,
sadiq