Yeah...I've got 2 left to get and I haven't seen one of them ever (the melon, wax).
hmm now I know why I sold mine last weekend for 24.999 within seconds... should upate my MM xD
Just a hint, where I have most of my murkmire blue prints. Once a day (if I don´t forget) I port to the blackrose prison wayshrine and ride into direction of the crafting station might of the lost legion. After the second bridge there is a smal house on the left with some boxes, container and a heavy sack outside (fun part - the heavy sack is always there - so seems not very populated). And inside some cabinets and chests. Takes just a minute but I get on average a blue print every second day. Mostly greens and blues. Just one purple since I m doing it.