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A forgotten box sitting for years in a Wisconsin storage unit has turned into one of the most remarkable Nintendo discoveries of 2026. Inside were 97 pristine Nintendo Entertainment System (NES) cartridges featuring Super Mario Bros. and Duck Hunt. What initially appeared to be a collection of common NES games turned out to be something much more significant: a previously undo cumented production variant that may be highly desirable to collectors.

The discovery is a reminder that some of the most valuable video game collectibles aren’t necessarily sitting in auction houses or carefully curated collections. Sometimes, they are hiding in boxes that nobody has opened for decades.

A Forgotten Box of Nintendo Games

The story centers on Kevin Braun, owner of the retro gaming shop OneStopWonders near Milwaukee, Wisconsin.

Braun had purchased a box of Nintendo cartridges years earlier. The games were acquired from someone connected to a family business that recovered precious metals from electronic circuit boards.

At the time, Braun believed the cartridges were ordinary and planned to sell them individually for roughly $10 to $15 each.

Instead, the box eventually ended up in his storage unit, where it remained forgotten for years.

That changed when Nintendo collector and Nintendo Wire editor-in-chief Jason Ganos learned about the box.

When Ganos saw the packaging and cartridges, he immediately recognized that something was unusual. The box wasn’t simply filled with old NES games—it appeared to have a connection to Nintendo’s original distribution and repair operations.

97 Cartridges That Nearly Became Scrap Metal

Perhaps the most incredible part of the story is how close these cartridges came to disappearing forever.

According to Ganos’ account, the games were apparently acquired for their potential value as electronic scrap. The gold-plated contacts inside cartridges could be recovered for precious metals, meaning the games were potentially destined for a recycling or smelting operation.

Instead, they were stored away.

Decades later, those same cartridges became a major discovery for the retro gaming community.

The original shipping box contained 100 cartridges, but only 97 remained. The box carried Nintendo of America-related markings and an inventory description identifying the contents as “Mario – Hunt Remanufactured NES.” The shipment was dated December 19, 1995.

The history of the box makes the discovery particularly fascinating because it appears to connect Nintendo’s manufacturing and repair ecosystem with a Wisconsin recovery facility.

Why These Super Mario Bros. Cartridges Are So Rare

At first glance, Super Mario Bros./Duck Hunt cartridges don’t sound particularly collectible.

Millions of NES owners encountered the games during the 1980s and 1990s. The combination cartridge was famously bundled with Nintendo hardware and became one of the most recognizable video game releases of its era.

But these particular cartridges are different.

The cartridges appear to represent an extremely late NES production run, with manufacturing information pointing to the 40th week of 1993. Collectors reportedly had not previously documented this particular version.

The cartridges also feature unusual labeling and manufacturing characteristics that distinguish them from more common releases.

Even more interesting, investigators discovered differences in the accompanying instruction manual, adding another layer of rarity to the find.

The Games Were in Remarkable Condition

Condition is critical in the world of retro video game collecting.

A common cartridge that has been heavily used may be worth relatively little. The same game in factory-fresh condition can be considerably more valuable.

That’s exactly what makes the Wisconsin discovery so extraordinary.

The 97 cartridges had apparently remained untouched for decades. After being examined and authenticated, the cartridges received exceptionally high grades from PSA.

Reported grades were 9.6 or higher, with five cartridges receiving a perfect PSA 10.

For collectors, that combination—an extremely unusual variant plus nearly perfect condition—is what transforms an otherwise ordinary NES game into a potentially valuable collectible.

How Much Could the Nintendo Cartridges Be Worth?

That’s the big question.

The exact market value won’t be known until examples actually sell at auction.

Three of the discovered cartridges are scheduled to be offered through Goldin Auctions beginning August 12, 2026, including one of the PSA 10 examples.

Early expectations suggest that the rare cartridges could command prices in the four- to five-figure range, although auction results will ultimately determine what collectors are willing to pay.

That’s a dramatic difference from Braun’s original expectation of selling the games for $10 or $15 apiece.

The discovery also illustrates an important rule of collectibles: rarity and condition can matter far more than the popularity of the game itself.

Why Retro Nintendo Collecting Continues to Grow

The Wisconsin discovery arrives during a period of intense interest in vintage video games.

Collectors increasingly look beyond simply owning popular games. They search for:

• Factory-sealed games
• Rare production variants
• Prototype cartridges
• Test cartridges
• Promotional releases
• Regional variants
• Manufacturing errors
• Unusual packaging
• High-grade examples

Nintendo’s early hardware is particularly attractive because of the company’s enormous cultural impact.

The NES helped establish franchises such as Super Mario Bros., The Legend of Zelda, Metroid and Mega Man as major parts of gaming history.

Rare NES cartridges can therefore represent more than just old software. They can be physical artifacts from the early development of the modern video game industry.

A Storage Unit Became a Time Capsule

Perhaps the most fascinating aspect of this story is that the cartridges weren’t discovered in a museum.

They were sitting in a storage unit.

Boxes of old Halloween decorations reportedly sat on top of the Nintendo box, leaving the cartridges undisturbed for years.

That makes the discovery feel almost like a video game version of a treasure hunt.

The cartridges survived because nobody realized how important they were.

Had the original purchaser sent them to a recycling facility, they could have been destroyed for their metal content. Instead, they survived long enough for collectors to recognize their historical significance.

What This Means for Nintendo Collectors

The discovery could encourage collectors to take a closer look at their own NES collections.

A cartridge that appears ordinary may contain a different manufacturing code, label variation, packaging difference or other characteristic that separates it from a common release.

That doesn’t mean every old Nintendo cartridge is suddenly worth thousands of dollars. Most aren’t.

However, the Wisconsin find demonstrates why serious collectors pay close attention to details that casual gamers might overlook.

Professional authentication and grading can also be important when dealing with potentially valuable games. Organizations such as PSA and CGC Video Games have developed increasingly sophisticated processes for examining and grading vintage game collectibles. CGC, for example, has previously authenticated rare NES test cartridges for The Legend of Zelda.

The Nintendo Treasure Hunt Isn’t Over

The Wisconsin discovery is an extraordinary example of how video game history can remain hidden in plain sight.

A box that was apparently destined for a recycling operation survived for decades in storage. What looked like a collection of ordinary Super Mario Bros./Duck Hunt cartridges turned out to contain a previously undocumented NES variant in extraordinary condition.

Now collectors will get their first opportunity to establish the market value of these games when the initial examples reach auction.

And that raises an intriguing possibility: How many other rare Nintendo cartridges are still sitting in closets, attics, basements and storage units around the country?

For retro gaming collectors, the answer could make the next forgotten box worth opening.

Final Thoughts

The Wisconsin Nintendo cartridge discovery is a perfect example of why retro gaming collecting has become so fascinating. The games themselves may be familiar, but small differences in manufacturing, packaging and condition can transform an ordinary cartridge into a piece of video game history.

For now, collectors will be watching the upcoming auctions closely.

If these rare Super Mario Bros./Duck Hunt cartridges bring the expected prices, this forgotten Wisconsin storage box could become one of the most memorable retro gaming discoveries of 2026.