Listing doesn't seem to say all original and if you look closely you can see the "N" for Norstrand in one Pic. But it still makes no sense to fight Reverb/buyer on this one.It's an important detail whether the seller described the instrument as all original or not. If it was specifically described as all original equipment and is not, the buyer has a point. Otherwise, a reasonable person should assume that a used instrument may have had some work done, and ask about that before the sale if it concerns them.
I believe this is the Sold listing: If I am wrong please let me know and I will edit this post.
Music Man Stingray 4 with piezo bridge Tobacco Burst