solution in my eyes (was already said in other topic):
New hard inferno zones with puzzle box droprate similar to buster/oculus ring, difficulty should be harder than Crucilbe lvl14
also current puzzle box system (duriel/baal/mark of sin) is BAD

and btw, i've never found any ctogga/tyrael/tragoul box since patch 4.1, its about 8 months of playing.