4 month old price:

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Sale 1: Not using

Don't know what was involved.

No outpost link available

http://backpack.tf/profiles/76561198062265789?time=1444546800&compare=1444978800

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Sale 2: Not using

Looked like a massive quicksell

http://www.tf2outpost.com/trade/27252636

http://backpack.tf/profiles/76561198213467859?time=1445583600&compare=1445670000

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Sale 3:

Sold for Factory New Cool Woodsy Widowmaker SMG

http://www.tf2outpost.com/trade/26964845

http://backpack.tf/profiles/76561198044195191?time=1442041200&compare=1442127600

X = 35.5(0.9)

X = 31.95

Rounding to 32 keys

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Mini on Woodsy Widowmaker SMG

Sold for $95 on the Steam Community Market (Credit to Mindacos for this information)

http://www.tf2outpost.com/trade/27207345

http://puu.sh/l8UOw/b996a100b5.png

http://puu.sh/l8Vx6/8242d28a9c.png - $95

http://steamcommunity.com/market/listings/440/Unusual%20Woodsy%20Widowmaker%20SMG%20%28Factory%20New%29

Keys were $2.48 at the time

95/2.48 = 38.3

Rounding to 38 keys

Seller recieves $82.61

82.61/2.48 - 33.3

Rounding to 33 keys

Taking a range of 33-38

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Sale 4:

Sold for

22 keys

10 keys in items

Cannot find an outpost link

http://backpack.tf/profiles/76561198021055079?time=1442127600&compare=1442214000

http://puu.sh/l8Wsl/adcaad507e.png

http://puu.sh/l8Wts/45a3f0dbdc.jpg

22 + (10*0.9) = 31

31 keys

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Sale 5: Not using

Looks like a bulk sale

No outpost link available

http://backpack.tf/profiles/76561198083691334?time=1446188400&compare=1446274800

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Sale 6: Not using

I have no clue. Possibly another bulk sale

http://www.tf2outpost.com/trade/27145949

http://backpack.tf/profiles/76561197986957306?time=1444287600&compare=1444374000

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Sale 7:

Sold for Green Black Hole Data Mining Light

No outpost link available

http://backpack.tf/profiles/76561198039749336?time=1442991600&compare=1442905200

X = 44*0.9

X = 39.6

Rounding to 40 keys

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Mining Light Mini:

http://backpack.tf/vote/id/563a3a47ba8d88ec1ba94bb8

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Sale 8:

Sold for Duped Strange Professional Killstreak Festive Sniper Rifle

No outpost link available

http://backpack.tf/profiles/76561198039749336?time=1442991600&compare=1443078000

X = 25*0.9

X = 22.5

Rounding to 23

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Sale 9: Not Using

Looks to have sold for CS:GO stuff

http://www.tf2outpost.com/trade/27104290

http://csgo.backpack.tf/profiles/76561198078173908?time=1442386800 (16th September)

http://csgo.backpack.tf/profiles/76561198078173908?time=1446537600 (3rd November)

http://backpack.tf/profiles/76561198007077925?time=1444028400&compare=1444114800 (Buyer)

http://backpack.tf/profiles/76561198078173908?time=1444114800&compare=1444028400 (Seller)

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Sale 10:

Sold with Strange Pro. KS Sniper RIfle for Roboactive Tungsten Toque

http://www.tf2outpost.com/trade/27040131

http://backpack.tf/profiles/76561198084768133?time=1442559600&compare=1442732400

X + 8 = 45*0.9

X = 32.5

Rounding to 33 keys

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Roboactive Toque Mini:

No recent valid sales, going with the 4 month old price of 45 keys

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Sale 11:

Sold for Molten Mallard Fur-Lined Fighter

http://www.tf2outpost.com/trade/27067563

http://backpack.tf/profiles/76561198069199626?time=1442559600&compare=1442646000

X = 39*0.9

X = 35.1

Rounding to 35

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Sale 12: Not using

Bulk sale

No outpost link available

http://backpack.tf/profiles/76561198069199626?time=1444546800&compare=1444460400

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Sales at:

23 - Outlier

31

32

33

35

40 - Outlier

Going with 31-35