Matt,
Just map the drive on the server that contains the xrefs with the same path name that you used before. If your xrefs are in the same directory as the drawing that they are attached to, then the xrefs will load when you load the drawing and you have the opertunity at that time to update the paths. You haven't lost anything so the incorrect path only matters when you load the drawing. If you aren't going to reload the drawings then who cares if the path is wronge.
Dave Alexander