For those who already have the BFE (or got it years ago) how did you mail back the signed paperwork and birth certificate? Did you just use the enclosed postage paid envelope? We only have 1 copy of DS's birth certificate and plan on enclosing the return SASE so when we'd get it back we know that they received the paperwork. My husband thinks that maybe we should track the envelopes. Is he just being overly paranoid?