I'm not quite sure why they haven't, but it may be due to the fact that people post on forums like Anishavie. In my opinion, if the Developers told us how rare the items were and where to find them, it would probably make drops in places with a lower percentage much less flooded and make it useless to have them drop there in the first place. I believe they left it up to the community to find out these things so that it's a lot more fun than having a guide made for us already.
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