Hat

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Sale #1 - Marketplace.tf

https://marketplace.tf/items/30974;5;u32

$30 / 1.92 = 15.6 keys, rounded to 16 keys

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Sale #2 - 25 keys

https://backpack.tf/profiles/76561198152372240#!/compare/1527984000/1528070400

https://backpack.tf/profiles/76561198052020077#!/compare/1527379200/1528070400

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Sale #3 - Untrace

https://backpack.tf/profiles/76561198050930436#!/compare/1531612800/1531785600

https://backpack.tf/profiles/76561198060520862#!/compare/1531526400/1531612800

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Sale #4 - Untrace

https://backpack.tf/profiles/76561198181811458#!/compare/1527811200/1527897600

https://backpack.tf/profiles/76561198433881964#!/compare/1527897600/1527984000

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Sale #5 - 15 keys

https://backpack.tf/profiles/76561198060520862#!/compare/1531612800/1531699200

https://backpack.tf/profiles/76561198300601676#!/compare/1531612800/1531699200

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Sale #6 - 13 keys + 3 keys in items

https://backpack.tf/profiles/76561198351777058#!/compare/1531612800/1531872000

https://backpack.tf/profiles/76561198114312016#!/compare/1531785600/1531872000

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Sale #7 - Sold For A Smoking NanoBalaclava + Ancient Codex Hot Air

https://backpack.tf/profiles/76561198351777058#!/compare/1531612800/1531872000

https://backpack.tf/profiles/76561198439812057#!/compare/1531526400/1531872000

Taking - 8.37 + 10.09 = 18.46, rounded to 18 keys

Nano Mini

https://backpack.tf/profiles/76561198073710034#!/compare/1531785600/1531872000

10 keys and 3 ref in sweets

-

Air Mini

https://backpack.tf/profiles/76561198312583107#!/compare/1527026400/1527112800

8 keys 12 ref

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Sale #8 - 1 For 1 With Strange Orb Planets Big Chief (low, not even gonna mini)

https://backpack.tf/profiles/76561198156299285#!/compare/1531872000/1531958400

https://backpack.tf/profiles/76561198795720774#!/compare/1531785600/1531958400

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Sale #9 - 1 for 1 with ausi wrench

https://backpack.tf/profiles/76561198156299285#!/compare/1529971200/1531872000

https://backpack.tf/profiles/76561198439812057#!/compare/1531785600/1531872000

Taking - 22 keys

Wrench Mini

https://imgur.com/a/h3VLG5i

22 keys is the average sale

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Overall Taking 16 - 22 keys

(Excluding)

15 (took less then a day)

25 (id's dont match)

13 (buy order)