Probably about 7 or so from 80 boxes, with a couple of those 7 being coins.
English
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Dang not a great return for 80 boxes.
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Not at all. Some people prefer the coins rather than a skin they don't want but honestly the legendary drop itself is so few & far between that I prefer a skin I won't use to 500 coins when I will need 2 legendary coin drops to purchase 1 legendary skin.