Yes you would be SOL. Better have the dealer run an oasis report on the VIN to see what service has been performed and to see if they have already denied warranty coverage for anything. They should do it for you without question if you ask. It costs nothing, and should be ran just like you would a carfax.
Thanks for the information; I'll keep that in mind if I decide to purchase one. I guess the only way I would get burned would be if the owner never had it to the dealer after he modified it, de-modded it, and sold it.