The concept of the Mystery Box is very simple, you don't know what exactly you're going to get. The content of the Mystery box will be much more valuable than the box's price. 

The Big Mystery Box includes up to 3 items. Might include very rare and unreleased items. You are able to pick the size of clothing for your Mystery Box. Every Mystery Box will have some special bonus inside like stickers, postcards etc.

Each Mystery Box is put together individually, there won't be any duplicates.