The only reason I'd want to keep the reward boxes is to prevent totems from being one of those "missed it; too bad, so sad" things new players might encounter.
They need to just add more consistently high rolling (better/equivalent) totems in high level dungeon/missions or some alternative in-game challenge. It does make for a nice incentive for events though, but it will be annoying if each season we have to get the next best one lol (then again thats how it is with anything on an mmo)