This is a set of two boxes: a 15th-anniversary commemorative mug & teacup set, and a change mug. The change mug is expected to change color or pattern, I'm not sure which, when hot water is added. All items are unused, but the change mug has a small stain on the bottom (see photo 11). Please purchase only if you understand that these items have been stored at home for a long time. Thank you for your understanding.