Just asking because 15 coins later still nothing.
Edit: Well 19 later and I got an engram. so they do work...eventually.
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If you don't get anything after 7 or 8, just give up for the day. I don't know how bungie works it...nobody really does. But some days, they just have it out for you, and you ain't getting anything. I used 2 the other day on ib and got an exotic. I played trials twice and got a doctrine. I've got a friend who plays trials every weekend and has never gotten a dop. Bungie is a fickle god, who givith, and more often than not, does NOT giveth