OK, thanks guys. I don't have any greater resolution photos, or a pic of the pad stamp. These pics were taken with my BB while squeezing myself underneath the car, and I wasn't able to get a pic of the pad without removing the alternator. The pad is properly dated and it looked to be OK to my eye, but...
Yes Kurt, this is a burgundy RS Z, although the current owner isn't a Rob. I take it the VIN is in the CRG database.
OK, it's enough that there's doubt about the stamps. I've got other complaints about the car too, so I'll pass on it. A knowledgeable friend of mine here had question about these stamps too. I shouldn't have second-guessed him.