Nothing will be removed for longer than a week, sorry Also drop rates have been lowered twice in Patch 4.2 alone, do you read the patch notes? As for the drop rate of puzzles and find item, this is COMPLETELY a placebo effect. Find Item literally just re-rolls the monster drop again, except it's chance of not dropping anything is related to Find Item level, not the amount of players in the game. I will probably nerf Find Item a little though.
50 is nowhere near hundreds, thats a large difference. Even then I don't think it was more than 20-30, I know who you're talking about I do believe. And it is as you said, RNG is RNG. It could take 20 chests to get a set, or it could take 500.