Sale 1 :

https://backpack.tf/profiles/76561198066311459#!/compare/1514592000/1514764800 Seller

https://backpack.tf/profiles/76561198208141749#!/compare/1514592000/1514764800 Buyer

Sold for Erie OF HFOHA + 3 keys

HFOHA Mini:

https://backpack.tf/profiles/76561197961452664#!/compare/1512950400/1513036800 Buyer

https://backpack.tf/profiles/76561198125791160#!/compare/1512950400/1513036800 Seller

Sold for 10 keys pure

https://backpack.tf/profiles/76561198129860851#!/compare/1512518400/1512604800 Seller

https://backpack.tf/profiles/76561198066434918#!/compare/1512518400/1512604800 Buyer

Sold for DBD Outdoorsman(15) +2 keys

Pricing Outdoors at 15 due to suggestion and its comments:

https://backpack.tf/suggestion/5a4196c3cf6c755dfe447f62

Total is 15 + 2 = 17 keys.

https://backpack.tf/profiles/76561198044203779#!/compare/1513296000/1513382400

Sold for Bubbling Belgian(12.5) + Flash of Inspiration(1.9)

Total is 12.5 + 1.9 = 14.4, rounding to 14 keys.

https://backpack.tf/profiles/76561198396942417#!/compare/1512691200/1512777600 Seller

https://backpack.tf/profiles/76561198044203779#!/compare/1512691200/1512777600 Buyer

Sold with 4 keys + craft hat for Mallard Steel-Toe(15.5)

15.5 - 4 = 11.5, rounding to 12 keys.

17 looks like an outlier, pricing at 10-14 keys. averaging at 12 keys.

12+3 = 15 keys.

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Sale 2 :

https://backpack.tf/profiles/76561198208141749#!/compare/1514592000/1514764800 Seller

https://backpack.tf/profiles/76561198158206236#!/compare/1514332800/1514764800 Buyer

Sold for Blizzardy Protector.

not using this sale, as the Protector cannot be priced due to discrepancies among the sales and history of the item.

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Sale 3:

https://backpack.tf/profiles/76561198158206236#!/compare/1514937600/1515024000

https://backpack.tf/profiles/76561198094231961#!/compare/1514937600/1515024000

Sold for Duped DP Geisha(13) + PF Brain Warming(11) + 1 key + 15 ref + 26 ref in sweets

Brain Warming was later sold for 9 keys and 18 ref in sweets.

https://backpack.tf/profiles/76561198292242424#!/compare/1514246400/1514332800

Geisha Mini:

https://marketplace.tf/items/363;5;u60

Sold for $29.29 (after fees converts to 11.05 keys)

https://backpack.tf/profiles/76561198175127305#!/compare/1515974400/1516147200

Sold for 10 pure

Valuing Giesha at 10.5 keys.

Total is 10.5 + 9.5 + 1 + 1.12(15 + 26 ref = 1.12 keys) = 22.12, rounding to 22 keys.

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Sale 4:

https://backpack.tf/profiles/76561198094231961#!/compare/1515024000/1515110400

https://backpack.tf/profiles/76561198133360797#!/compare/1515110400/1515369600

Sold for Planets Hallmark + KW Hive Minder + Strange Loose Cannon(2.6) + Cardboard(3.15) + Buds

Hallmark & Hive Minder sold for 18 keys 7 ref to bot.

Buds sold to bot for key and 26.22 ref

valuing at above prices for sake of sale.

18 and 7 ref + key and 26.22 = 19.9 keys.

19.9 + 2.6 + 3.15 = 25.65, rounding to 26 keys.

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in total:

15, 22, 26.

15 looks like an outlier, setting range from 22 to 26 keys.