Driveline is worth big money to a Dandenong HQ GTS owner as it is a QU stamp, not 11QU like Statesmans. The engine, box, radiator, A/C, power steering, diff etc would pull well in excess of $5000 if he were to part it out.
VIN tag missing is no drama as it is known whib one of the 4 x cars it is since the other 3 x have been located. Just get another one made for it.