Umm, it definitely is the thing. I have gotten only -one- maze. I read the theory about having a full inventory, and that same day I got -tons- of mazes(and two Forresters.) I never train without a full inventory, and I always get a maze. And this isn't only my experience.. there's a thread in General forums about it, and tons of people have tried it out and they all agree - full inventory is the way to go. So, sorry if you aren't getting a random. xD