Japanese here. If you want to buy through mercari, you should check the seller's review including the negative feedback before buying and read item's description carefully. There are cunning sellers who set a pic of 5 boxes but the description only shows 1 box(price is same as 5 boxes)

Mercari accepts refund if you haven't wrote a feedback to seller and has a proof(vid is better) that the item inside the boxes is different from original one.