more detail

NSC-NIW
I-140 RD 01/06 (self)
I-140 AD 12/06
I-485 RD 03/06 (self and spouse)

今天夫妻兩個都收到這樣的email:

On February 27, 2007, we mailed a notice requesting additional evidence and/or information in this case. Please follow the instructions on the notice to the evidence and/or information requested...

因為還沒收到正式的信件，不知道需要補什麽。所以想問問有類似經曆的朋友，你們被要求補的什麽？另外，我看到論壇裏有朋友說正式的要求補材料的信寄到了律師那裏，是這樣嗎？

謝謝