Either these things are extremely rare drops at level 60 or I have terrible luck. I think I have 1 total. I see them all the time for sale in 1 to 29 chat. Makes me wonder if rolling new characters is the way to find them. I play 4 hrs or more a day. I do rifts, farm mobs, strongholds, dailies, and onslaughts and they continue to elude me. The boxes should be dropping frequently with the point being to sell keys on the store. Check out neverwinter on this.