Sky Guy

Sale #1 - SCM

https://backpack.tf/profiles/76561198000322172#!/compare/1523577600/1523664000

https://backpack.tf/profiles/76561198327709625#!/compare/1523145600/1523232000

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Sale #2 - SCM

https://backpack.tf/profiles/76561198093266755#!/compare/1522540800/1523923200

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Sale #3 - SCM

https://backpack.tf/profiles/76561198165760088#!/compare/1523577600/1523664000

https://backpack.tf/profiles/76561198127352357#!/compare/1523145600/1526169600

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Sale #4 - 18 keys 20 Ref

https://backpack.tf/item/3158884528

https://backpack.tf/profiles/76561198305676157#!/compare/1522972800/1523059200

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Sale #5 - 12 Keys

https://backpack.tf/profiles/76561198046212402#!/compare/1525046400/1525132800

https://backpack.tf/profiles/76561198165802400#!/compare/1525046400/1525132800

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Sale #6 - 1 For 1 With Duped CHeart Bombing Run

https://backpack.tf/profiles/76561198046212402#!/compare/1525132800/1525305600

Taking 14 keys

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Bombing Mini

https://backpack.tf/profiles/76561198085465277#!/compare/1525046400/1525305600

Sold for 14 Keys

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Sale #7 - Sold For Atomic Hot Air + Pro Ks Vint Back Burner

https://backpack.tf/profiles/76561198127123822#!/compare/1526083200/1526256000

Taking 12 + 3.3 = 15.3, rounding to 15 keys

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Hot Air Mini

https://backpack.tf/profiles/76561198111066894#!/compare/1524268800/1524614400

Sold for 13 keys 6 Ref,

Sellers at 11.25 keys

https://imgur.com/a/ph7bnKq

Taking 11 - 13 keys / 12 keys in the middle

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Back Mini

Could not find a specific mini

going with the kits price

https://steamcommunity.com/market/listings/440/Professional%20Killstreak%20Backburner%20Kit

8.23/2.47

Taking 3.3 Keys

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Overall, Taking 12 - 15 Keys