A batch of 97 cartridges containing an unseen edition of Super Mario Bros. and Duck Hunt for the Nintendo Entertainment System (NES) has been discovered in an attic in Wisconsin. The cartridges, found in a box stamped with a Japanese label and the "NES" marking, were originally intended for recycling due to the gold on their pins. The box was inherited by a man whose grandfather had run a precious metal recovery business in the 1980s and 1990s, which had a contract with Nintendo. After being stored for about 20 years, the box was acquired by Kevin Braun, an owner of retro shops, who later shared it with Jason Ganos, a Nintendo news reporter for Nintendo Wire. The cartridges were found to be in impeccable condition, each packaged in the same bag provided with an official NES console, and each accompanied by a new and perfectly preserved game manual. The discovery was made after Jason examined the box and confirmed that the cartridges were produced in late 1993, making them the last edition of Super Mario Bros./Duck Hunt ever made. The back label of the cartridges contained text in multiple languages, differing from the standard English-only text typically found on such cartridges. The manufacturing codes on the cartridges and instruction manuals also indicated a unique production batch. Experts examined the cartridges and noted that the manuals contained new text, with the phrase "maintenance or service" replacing the standard "maintenance or repairs." The purpose of this edition remains unclear, with speculation that the cartridges may have been intended for warranty repairs, refurbished systems, or a planned but unmarketed pack. The economic value of the cartridges is significant, with some estimated to be worth over 8,500 euros individually. Jason Ganos took the 97 cartridges to PSA, an appraisal company, where 12 of them were rated, with several receiving high scores, including a previously unseen score of PSA 10. The cartridges were divided into three parts: some to be sold at auction, some at charity auctions, and some to be kept by Ganos and Braun. Scans of the manuals and photos of the cartridges have been made available online. The story of the discovery has been shared widely, with Jason describing it as a tale more exciting than fiction.