I gather that prototypes often (usually) have some kind of paper-trail or list of prior owners/holders' names that leads back to someone at Hasbro, or the factory--the source of these things.
Otherwise, it's easy enough to fake such things....a shot of gloss coat and it looks "shiny". The pics are just blurry enough to be hard to make out and without any kind of means of authenticating it.......aside from the seller's word.............there's too many red-flags to this thing.