~16 months outdated!

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Sale 1:

Sold for 10 keys

http://www.tf2outpost.com/trade/27143984 - Original B/O of 13 keys, Had offer of 11

http://www.tf2outpost.com/trade/27183903 - B/O of 12 keys

http://backpack.tf/profiles/76561198119142705?time=1442818800&compare=1444201200

= 10 keys

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Sale 2:

Sold for 14 keys

http://www.tf2outpost.com/trade/27273931 - B/O of 14 keys

http://backpack.tf/profiles/76561198042938501?time=1445410800&compare=1445324400

= 14 keys

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Sale 3:

Sold for Miami Nights Carouser's Capotain = 14 keys

http://www.tf2outpost.com/trade/27281616

http://backpack.tf/profiles/76561198139175696?time=1445756400&compare=1445670000

Outpost Histories Confirm this:

http://www.tf2outpost.com/item/440,4232076435,95,5

http://www.tf2outpost.com/item/440,4256334009,259,5

14*0.9 = 12.6

Rounding to 13 keys

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Sale 4:

Sold with:

Strange Killstreak Festive FaN - 1.5 keys

For:

Duped Kill-a-Watt Sober Stuntsman

No Outpost link available

http://backpack.tf/profiles/76561198126868108?time=1446274800&compare=1446361200

X + 1.5 = 13.5(0.9)

X = 10.65

Rounding to 11

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Stuntsman Mini:

Sold for Aces High Hot Dogger - 15 keys

http://www.tf2outpost.com/trade/27336870

http://backpack.tf/profiles/76561198079395955?time=1446361200&compare=1446537600

15*0.9 = 13.5 keys

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Hot Dogger Mini:

Sold for Strange Pro. KS Australium FaN = 15 keys

http://www.tf2outpost.com/trade/27309596 - B/O of 15

http://backpack.tf/profiles/76561198154426427?time=1446188400&compare=1446274800

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Sale 5: Not using

Dunno

No outpost link available

http://backpack.tf/profiles/76561198108354144?time=1444114800&compare=1444028400 - Buyer

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Sale 6:

Sold for 12 keys

http://www.tf2outpost.com/trade/27078349

http://backpack.tf/profiles/76561198019505106?time=1442905200&compare=1442991600

= 12 keys

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Sale 7:

Sold for:

Orbiting Fire Waxy Wayfinder = 14 keys

1.5 keys in items

http://www.tf2outpost.com/trade/27131794

http://backpack.tf/profiles/76561198151387339?time=1443337200&compare=1443250800

15.5*0.9 = 13.95

Rounding to 14 keys

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Sale 8:

Sold for

Duped Steaming Bubble Pipe

A singular key

No outpost link available

http://backpack.tf/profiles/76561198195513055?time=1443423600&compare=1443596400

X = 13(0.9) + 1

X = 12.7

Rounding to 13 keys

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Bubble Pipe Mini:

Couldn't find a proper sale

http://www.tf2outpost.com/trade/27232986 - B/O of 13

http://backpack.tf/profiles/76561198102256825?time=1444719600&compare=1444806000 - Sold for something

Going with 13 here

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Sale 9:

Sold for:

Miami Nights Bloke's Bucket Hat

A singular key

http://www.tf2outpost.com/trade/27151187 - B/O of 16 keys "Themed"

http://backpack.tf/profiles/76561197975785720?time=1444114800&compare=1444028400

X = 14*0.9 + 1

X = 13.6

Rounding to 14 keys

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So, we have sales at:

10

11

12

13

13

14

14

14

Going with 13-14, as it seems to be the most common