Event mystery boxes are available from the second half of the 2017 Valentine's Day event. They are earned by giving Wizard Deedit specific amounts of fabric scraps for progress in the event, or by directly converting the scraps. They contain a variety of Treasure Hunter items and some Valentines-specific items from past promotions.
When opened, event mystery boxes yield a total assortment of three rewards, and the box is destroyed. Three open inventory spaces are required to open a box. The following is a selection of prizes which players can receive from one: