AyynoIn my experience (I've bought pretty much an entire case from Gamestop) there aren't any duplicates in an entire case (12 boxes) at least I didn't get any in the 8 that I bought (missed out on four of em). Now that's for retail, no idea how they're packaged for MD. It's possible I suppose that if they just send 12 blind boxes and not an actual case you could get dupes.
I don't want to buy a whole box and just get a whole bunch of duplicates.