Sounds like they did the right thing in offering you new skis.....I'm sure it was a weird mishap (it's toooo easy to trust those jigs!!!). Good job to GM sports.
It's one thing to mount too far forward/back, it's a little different if they off-mount to the side. There's no way your bindings (if the same are used) will mount well to that ski with only an eighth of an inch difference....you'll bust your binding off in no time. I bet you'll never notice a difference in performance with the bindings remounted slightly forward (just make sure the new holes aren't too close to the old and that the old are filled with epoxy with adequate time to set before re-mounting).
I will embarrassingly admit that when I tech'd, I made a mistake similar to this......on a pair of skis that were discontinued......OUCH. Only mistake I ever made in thousands of mounts. Dude got new skis.........and he got to keep the skis I jacked.