Stardew Valley’s 1.6 update added Mystery Boxes, which can be opened at Clint’s to get a random assortment of rewards.
Mystery Boxes are a new type of treasure item found in Stardew Valley’s 1.6 update. These boxes can be opened to get rewards, but you won’t actually see any Mystery Boxes around the valley until you meet certain unlock criteria.
Below, we describe where to find Mystery Boxes and how to open them in Stardew Valley.Where to find Mystery Boxes in Stardew Valley
The Stardew Valley Wiki notes that once you spend 50 days in the valley or you collect a prize ticket, you’ll unlock Mystery Boxes.