I've gotten 5 shards (+3) a number of times, but I've never seen 15. Must be really rare.
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Paragon Cache (epic box) :
-You've received 75 Silver!
-You received 50 Atlantean Shard.
no sub bonus applied to the shards from the box ...
That's not a lot when you consider the effort to gain those boxes.
A guildy of mine got 200 shards (almost 3 weeks worth of raidfinder) today from the box though so it can be quite a good reward too.
Got today:
blue box: money (30s) and gilding tokens (2)
purple box: 70 silver, 100 atlantean shards and another 50 or 75 silver and 50 shards.
Purple box
75 silver
50 atlantean shards
Purple cache :
2 AA points + 75 S on a full AA Character after a month of challenges!!!
I wont be completing the challenges anymore until they fix the rewards