How many coins (leafs) you need to get all the lengendary set?

Up around 9x coins so far. I had gathered between 4000-5000 leaves while doing the the first 4 quests in ToT, and grew 21 or so trees in the process. Still have the boxes to open yet, but I have 200+ of those, so kind of avoiding that at the moment. Don't feel like being clicky-clicky all day.. Can those boxes be hotkeyed?

Also, anyone know what the stats of the buff thing from the trees is?