Of course, this could just be a case of nasty luck, but I and others have noticed that the earlier areas of the event seem to be giving less chests than normal. Again, maybe bad luck, but I just got to area 70 in a run without a single chest drop. 14 boss areas and not a single chest drop? That seems very odd, even accounting for bad luck. Maybe it's nothing, but the fact that so many areas passed, and other people have had these same suspicions, I figured it was at least worth bringing to attention to check.