As you might have noticed has there been a small purple box that had been sneaking itself into the daily quests of the Challenge Tower and Random Matching.
These boxes cannot be obtained when finishing the quests.
Not obtaining these boxes, as you finish the quest, is intentional.
You can think of them as just a visual treat, if you like so.
We apologize for the confusion they cause and ensure that these boxes will be fully available at a later update.
Your EOSP Team