Warning - Augment Cache's have questionable odds
I ended up purchasing around 25-30 Augment Cache's. I had never bought skins and figured this would be a good time to get some.
Since each case contains either 2 skin shards or 1 skin shard/1 champ shard, I figured out of the 566 possible skins(as of 2015), I had a really good chance of getting a variety of skins.
My problem was that through 30 cases, I ended up getting 7 duplicate skin shards. For calculation purposes, let's say I bought 30 cases. That is an 11% chance of duplicate skins(7 of a possible 60), which are very different than what was presented. While the odds don't appear to be visible, it seems there is a very small pool of which skins can be gained.
My Duplicate Shards were -
2 Magnificent TF's shards
2 Deep One Kassadin shards
2 Cutthroat Graves shards
2 Academy Darius shards
2 Gravelord Azir shards
2 Dark Crystal Ryze shards
2 Dragonslayer J4 shards
I would urge anyone considering to buy Augment Cache's to be aware of this and be aware that Riot is cheating you. These Cache's are not worth your money and I wouldn't be shocked if someone unlocked even more duplicates than I did.
I would only buy Augment cache's under these circumstances:
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You do not have many skins
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You do not care which skins you get
If anyone else has bought 20 Cache's or more I'd be interested to hear from you as I do think the odds are duplicates are lower with your first 10 cache's.
My full list of cache unlocks are here - http://boards.na.leagueoflegends.com/en/c/gameplay-balance/E6wGZU8O-just-unlocked-about-25-30-augment-caches-and-wanted-to-share-what-i-got-and-some-thoughts