Big 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.
Ironmen can earn and claim these boxes, but cannot open them.
When opened, big event mystery boxes yield a total assortment of five rewards. The following is a selection of prizes which players may expect to receive from one: