It was a Donkey Kong Competition prototype cart that was in a case similar to that of the SNES Campus Challenge. I was contacted by a member of Atari Age when the game wasn't even being advertised for sale. He must be a big fan of either Donkey Kong, SNES, prototypes, or comp carts. Whatever the reason, I wasn't about to turn down that type of money for a paperweight.
You mentioned in a previous post that you've seen non-working prototypes sell for next to nothing in the past. Do you happen to recall any of those sale or have any links to such sales? I'm just curious as I don't know of any such prototype sale in recent history, and I tend to be pretty active in those type of things.