I think the seller is being fair; he actually says he doesn't know what the chip is.
Anyone considering buying something like this should know enough to do their homework, and if they do they'll know this isn't from the movie. ...probably. I mean, honestly, this is pretty esoteric knowledge. But that's exactly the sort of thing that a movie prop collector should be prepared to find out.
Alas, it'll probably end up going to someone who thinks it's genuine. But hey, maybe they'll never find out and never sell it, and if it makes them happy who am I to burst their bubble?