I just finished Crypt of Heart, my FIRST dungeon of the day and after defeat the last boss I've got NO REWARD, no golden box, nothing. I checked and defeated all dungeon's bosses.
Check the crown store. When it goes down, it will say “crown store is unavailable”. You won’t get a drop. We wait until it comes back up before we continue farming. It goes down randomly during the day. It’s tied to the event.
After review we have closed this thread as there is another thread about this topic already. If you wish to continue this discussion you may do so on the other thread located here. Additionally to reiterate what Jessica has stated: We're investigating - in the meantime if you don't get your event tickets or box drop as you should, please do submit a Support Ticket.