Looserd, as child derivative,if you were 21 years of age at the time your application for green card was filed,your RFE will be definetely a ''NUNC PRO TUNC''.If you were not yet 21,RFE might be copy of your I-94,National passport,photo,proof of 1 year presence or proof of travels.Any way,RFE is not a big deal.It's just formality.Never been upset to any kind of RFE you receive.Please react.Thanks.