Sellers:

https://gyazo.com/1e66392d95cc7389dfeb7a19690e37e0

http://backpack.tf/item/2786781936 12.2 (5 days)

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Sale #1

http://backpack.tf/profiles/76561198043913145#!/compare/1476576000/1476662400

Histories don't match

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Sale #2

http://www.tf2outpost.com/trade/28547575 12 b/o

http://backpack.tf/profiles/76561198091558001#!/compare/1476576000/1476662400

Sold with 5 ref for a Smoking Batter's Helmet(13)

Sale total: 12 keys

Batter mini:

http://backpack.tf/profiles/76561198091558001#!/compare/1475712000/1475798400

Sold for 13 keys

Mini total: 13 keys

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Sale #3

http://www.tf2outpost.com/trade/28549269 12 b/o

http://backpack.tf/profiles/76561198091558001#!/compare/1476662400/1476748800 seller

http://backpack.tf/profiles/76561198035164910#!/compare/1476662400/1476748800 buyer

Sold for 11 keys + metal = 12 keys

Sale total: 12 keys

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Sale #4 sold within a day, so taking this as an outlier(there is also a buyer at 11)

http://www.tf2outpost.com/trade/28551065 11.5 b/o

http://backpack.tf/profiles/76561198035164910#!/compare/1476748800/1476835200 seller

http://backpack.tf/profiles/76561198076912592#!/compare/1476662400/1476835200 buyer

Sold for 11 keys

Sale total: 11 keys

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Sale #5

http://www.tf2outpost.com/trade/28554316 12 b/o

http://backpack.tf/profiles/76561198076912592#!/compare/1477094400/1477180800

Sold for a Cool Specialized Killstreak Blitzkrieg SMG (Field-Tested)(14) + 2 keys

14 + 2 = 16

Sale total: 12 keys (b/o caps)

SMG mini:

http://www.tf2outpost.com/trade/28547212 15 b/o

http://backpack.tf/profiles/76561198072999934#!/compare/1476921600/1477008000

Sold for a Bubbling Tippler's Tricorne(12) + 2 keys

Mini total: 14 keys

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Let it banana