Sellers: https://gyazo.com/a2eadfc9483f642a2971771a52ee1a8e 18, 19, 24

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Sale #1 outlier

http://backpack.tf/profiles/76561198119523579#!/compare/1472083200/1472169600 seller

http://backpack.tf/profiles/76561198018823628#!/compare/1472083200/1472169600 buyer

Sold with a Kill-a-Watt Pugilist's Protector(16) + 4 keys for a Ancient Codex Universal Translator(28)

28 - 16 - 4 = 8 keys

Sale total: 8 keys

Mini for Protector:

http://www.tf2outpost.com/trade/28462082 seller at 17

Didn't find sales so using current price = 16 keys

Mini for Translator:

http://www.tf2outpost.com/trade/28462755 30 bo

http://backpack.tf/profiles/76561198060118306#!/compare/1472947200/1473120000 seller

http://backpack.tf/profiles/76561198045285989#!/compare/1473033600/1473120000 buyer

Sold with 1 key for a Nuts n' Bolts Cotton Head(42.5)

42.5 - 1 = 41.5 = 42 rounded (caps at 30 keys)

http://www.tf2outpost.com/trade/28395899 29 bo

http://backpack.tf/profiles/76561198184164851#!/compare/1470355200/1470528000 seller

http://backpack.tf/profiles/76561198068070893#!/compare/1470441600/1470528000 buyer

Sold for a Bubbling Magistrate's Mullet(11) + Bubbling Tartan Spartan(15)

11 + 15 = 26 keys

Translator mini total: 26-30 = 28 keys

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Sale #2

http://www.tf2outpost.com/trade/28462082 17 bo

http://backpack.tf/profiles/76561198018823628#!/compare/1473206400/1473292800 seller

http://backpack.tf/profiles/76561198053848679#!/compare/1473033600/1473292800 buyer

Sold for a Isotope Low Profile SMG (Minimal Wear)(17.5) + 1 key

17.5 + 1 = 18.5

Sale total: 19 keys

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Sale #3 not usable

http://backpack.tf/profiles/76561198053848679#!/compare/1473292800/1473379200 seller

http://backpack.tf/profiles/76561198120780147#!/compare/1472860800/1473379200 buyer

Sold with a Orbiting Fire Bubble Pipe for a Vivid Plasma Brim-Full Of Bullets

Sale total: keys

Bubble Pipe mini:

http://backpack.tf/profiles/76561198073043609#!/compare/1470873600/1470960000 seller

http://backpack.tf/profiles/76561198045399559#!/compare/1470614400/1470960000 buyer

Sold for 16 keys

Bubble mini total: 16 keys

Brim mini:

Cant find so not using this sale

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Sale #4 outlier

http://www.tf2outpost.com/trade/28476480 19 bo

http://backpack.tf/profiles/76561198120780147#!/compare/1473379200/1473465600 seller

http://backpack.tf/profiles/76561198105403049#!/compare/1473292800/1473379200 buyer

Sold for 10 keys

Sale total: 10 keys

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Let it banana