Rare NES Cartridges Found in Wisconsin: How Storage-Unit Discoveries Are Reshaping Retro Game Collecting

A forgotten storage unit in Waukesha doesn’t sound like the start of a treasure hunt. Dust, cardboard, a padlock nobody’s touched in years. But that’s exactly where nearly 100 Nintendo Entertainment System cartridges turned up this year, including a version of Super Mario Bros. That collectors had never catalogued before. ABC7 Chicago reported the total haul could be worth millions once graded and sold individually. That’s not hyperbole. It’s math. Grading changes everything. What Was Actually in the Box The…