Rare Nintendo cartridges discovered in Waukesha storage box

A box of old Nintendo games found in Waukesha turned out to contain nearly 100 copies of a previously unknown version of "Super Mario Bros." and "Duck Hunt." The owner of "One Stop Wonders" said the person who sold the box claimed Nintendo had sold the cartridges to a metal recovery service to be melted down for gold, but they were never destroyed. "These were printed about two years after the last known printing of these games. So no one understands fully why Nintendo made a box of 100 of these," Jason Ganos of Nintendo Wire said. "The back sticker on the cartridge is different. The screws are different. The manual is different. Even the motherboard for the game is different. So this is one of the most-documented games in the history of video game preservation and nobody has seen these specific carts before," Ganos said. Some of the cartridges are in perfect condition and have earned the world's first PSA 10 grade for an NES game. Three of the cartridges are set to hit the auction block this month and could fetch millions.