Well, I didn't pay that much, and the MVS and KOF99 are legit.
He also didn't advertise them as being legit, and I didn't ask.
If I had at any point thought they might be authentic, I would have asked, but frankly, I never did.
The Zupapa and Super Dodge Ball both play fine, have good CRCs. If I have the opportunity to replace them with legitimate games, I might, but I'm not sure it's worth it. Assuming the boots are worth ten bucks each (a lowball given that one is SDB), and the KoF is 10 bucks, twenty bucks shipping, I got a thirty dollar one-slot.