A retro shop owner based in Waukesha, Wisconsin, located some 15 miles west of Milwaukee, discovered that he was holding on to a rare stash of NES carts in his storage room. According to Nintendo Wire, these cartridges were never-before-seen versions of Duck Hunt and Super Mario Bros., which were some of the most popular games on the Nintendo Entertainment System. What’s more important is that these haven’t been opened, and the original owner said that these supposedly came directly from Nintendo of America. Their condition is so pristine that PSA (Professional Sports Authenticator) gave them extremely high grades of no less than 9.6, with five units getting the coveted perfect 10.

Kevin Braun, the owner of the retro shop OneStopWonders, said that a person sold him the cartridges years ago and that they’ve just been sitting untouched in his storage unit. The man said that his grandfather owned a business that recovered precious metals from circuit boards, and that this box was supposedly sold to him for salvaging. It’s unknown how it ended up in storage instead of recycling, but Braun bought it from the seller, thinking he could resell it in his shop for around $10 to $15 each.

Thankfully, he forgot about these cartridges until his friend and EIC of Nintendo Wire, Jason Ganos, got a chance to look at them. When he saw the carts for the first time, Ganos knew that he was looking at something special but didn’t realize how exceptional they were until he shared the find on a high-end gaming Facebook group. Two different people working as directors at different grading companies then reached out to him, telling him that there was something strange about these cartridges. They then asked for more photos of one cartridge and the manual and even told him to disassemble one unit for a deeper inspection.

This is where he discovered that these cartridges were some of the last produced units made during the 40th week of 1993. The manuals weren’t seen before, either, with the back page saying, “maintenance or service,” whereas previous known versions said, “maintenance or repair.” Because of these finds, he proceeded to take a flight to PSA in California early the next morning, where the grading company confirmed its authenticity.

It seems that the cartridges in the box were made as replacements for warranty repairs or refurbished consoles, or as part of a bundle that never saw release. We would never know which is true, though, unless Nintendo of America confirms why they were made. If you’re an avid collector or simply want to get your hands on an original Nintendo game that hasn’t been released, three carts will be auctioned off at Goldin Auctions starting August 12.

It’s unclear how much these carts will go for, but it’s estimated that they’d cost at least four digits, with the perfect 10s possibly hitting five digits. This is possible, given that an ultra-rare NES Gold Nintendo World Championships cartridge auction sat at $77,000 and probably sold for a much higher price. So, if you want to get your hands on this, you’d better have a war chest of at least $100,000 to guarantee that you can get one — just don’t blow on it if you insert it in your NES console and it doesn’t work for the first time.

Get Tom's Hardware's best news and in-depth reviews, straight to your inbox.

Jowi Morales is a tech enthusiast with years of experience working in the industry. He’s been writing with several tech publications since 2021, where he’s been interested in tech hardware and consumer electronics.