-- Last Updated: Oct-15-12 9:27 AM EST --
I agree you should ask for more pictures.
You would not see the ABS plastic or foam core of the Royalex unless the boat was damaged or the gunwales removed. The inner vinyl layer of Royalex was most often gray (as in this boat) but sometimes beige or light green. The solid ABS plastic could be just about any color. The outer vinyl layer of this boat is green, obviously.
What else can you tell from the photos other than the boat is a Mad River made of Royalex?
It has some minor damage to the outer vinyl layer of the hull (scratches and shallow creases) which are of cosmetic significance only. One photo shows an area of damage to the inner hull in which some of the inner gray vinyl has been scratched off exposing small areas of ABS. Again, probably no big deal, but it might be a good idea to seal these areas down with some epoxy of some type and maybe paint over the epoxy.
One picture shows a portage yoke strongly suggesting the boat is a tandem, so it is probably not a Courier which was/is a solo. It is most likely a Royalex Explorer but MRC also made the Eclipse in Royalex which had a shallow V bottom as well and was described by MRC as "similar in concept to our Malecite". To my knowledge, MRC never made a Royalex boat they called the Malecite. MRC also made the 17' Revelation in Royalex with a shallow V bottom.
You can also see that the boat has aluminum gunwales and plastic deck plates. What you can see of the wood looks pretty good, but it looks as if it is due for a sanding and re-varnishing or re-oiling.
If the owner can't or won't send more pictures ask for an exact overall length and beam measurement so you can identify the model. Also ask what kind of condition the seats are in.