RKS,
You may not get the same mobo back. Sometimes after testing, if it's bad, they will just ship a new (or refurbished mobo) for your time convenience, then they will repair and send that mobo to another RMA'er, or trash it if it's too expensive to repair. Check you serial number to see if it's the same board.
BUT, your main concern... if they send it back it has presumably been repaired and should work (and boot)... If it doesn't re-check the premise that it's a bad board and re-RMA it!!
Noel