Sale 1:

Sold for 20 keys

http://www.tf2outpost.com/trade/27712328

Seller: http://backpack.tf/profiles/76561198050215277/#!/compare/1452844800/1452931200

Buyer: http://backpack.tf/profiles/76561198195234518/#!/compare/1452931200/1453017600

X = 20

Sale 2:

Sold for 17 keys

No outpost link available

Seller: http://backpack.tf/profiles/76561198123491005/#!/compare/1457078400/1457251200

Buyer: http://backpack.tf/profiles/76561198104603446/#!/compare/1457078400/1457251200

X = 17

Sale 3:

Sold for 18 keys

No outpost link available

Seller: http://backpack.tf/profiles/76561198182328219/#!/compare/1457164800/1457251200

Buyer: http://backpack.tf/profiles/76561198099941285/#!/compare/1456041600/1457251200

X = 18

Sale 4:

Sold for 16 keys, strange thirst blood and 9 ref

http://www.tf2outpost.com/trade/27882184 - No B/O

Seller: http://backpack.tf/profiles/76561198115775158/#!/compare/1456387200/1456473600

Buyer: http://backpack.tf/profiles/76561198127119404/#!/compare/1456387200/1456473600

X = 16 + 1 + 0.5

X = 17.5

Rounding to 18

Sale 5:

Sold with 4 keys for Peace Sign Thirst Blood

http://www.tf2outpost.com/trade/27729023 - B/O of 20

Seller: http://backpack.tf/profiles/76561198195234518/#!/compare/1453190400/1453276800

Buyer: http://backpack.tf/profiles/76561198042574722/#!/compare/1453017600/1453190400

X + 4 = 20

X = 16

Sale 6:

Sold for:

C9 Pugilist (11)

Uncraftable Team Spirit Aqua Flops (3)

Box Trot (1)

http://www.tf2outpost.com/trade/27909628 - B/O of 18

Seller: http://backpack.tf/profiles/76561198127119404/#!/compare/1456560000/1456905600

Buyer: http://backpack.tf/profiles/76561198014005199/#!/compare/1456732800/1456819200

X = 11 + 3 + 1

X = 15

Sale 7:

Sold with Approx. 8 keys worth of cosmetics and metal for Spec. KS Australium Flame Thrower

No outpost link available

Seller: http://backpack.tf/profiles/76561198159425816/#!/compare/1457769600/1457856000

Buyer: http://backpack.tf/profiles/76561198074422554/#!/compare/1457251200/1457856000

X + 8 = 19

X = 11

Sale 8:

Sold for Steaming Industrial Festivizer...

http://www.tf2outpost.com/trade/27757528 - B/O of 20, "Would prefer engi unusual"

Seller: http://backpack.tf/profiles/76561198167847270/#!/compare/1453795200/1454486400

Buyer: http://backpack.tf/profiles/76561198239297042/#!/compare/1453795200/1454054400

Sale 9:

Looks to have sold with an unusual pistol for an Aces High Patriot Peak + Bruiser's Bandana

Seller: http://backpack.tf/profiles/76561198206735991/#!/compare/1456473600/1457856000

Buyer: http://backpack.tf/profiles/76561198123491005/#!/compare/1456905600/1456992000

Would be better to update the Patriot with this sale.

Sale 10:

Sold for Orbiting Fire Milkman

No outpost link available

Seller: http://backpack.tf/profiles/76561198143221215/#!/compare/1457164800/1457251200

Buyer: http://backpack.tf/profiles/76561198182328219/#!/compare/1457164800/1457251200

The Milkman appears to be invisible in both these links for whatever reason, but the histories do match:

http://backpack.tf/item/3003235756 - thirst

http://backpack.tf/item/3033116929 - milkman

Would rather use this to update the milkman

Sale 11:

Sold for an Unusual Scattergun:

Seller: http://backpack.tf/profiles/76561198079456822/#!/compare/1455091200/1457164800

Buyer: http://backpack.tf/profiles/76561198115775158/#!/compare/1455782400/1456214400

There was a trade hold

Sale 12:

Sold for Terror-Watt Tavish Degroot

http://www.tf2outpost.com/trade/27909862 - B/O of 21

Seller: http://backpack.tf/profiles/76561198014005199/#!/compare/1456819200/1456905600

Buyer: http://backpack.tf/profiles/76561198031405199/#!/compare/1456819200/1456905600

The hat sold about 4 times in a day, which may make some sales difficult to determine, or even untraceable.

With the abundance of sales here, it would be best to use this sale to update the Tavish.

Sale 13:

Sold for Overclocked Napoleon Complex

Seller: http://backpack.tf/profiles/76561198105245989/#!/compare/1457424000/1457510400

Buyer: http://backpack.tf/profiles/76561198082745087/#!/compare/1457424000/1457510400

Complex is unpriced, best to use this sale to price it.

Sellers:

19 keys:

http://www.tf2outpost.com/trade/27929500 - 2 weeks

20 keys:

http://puu.sh/nUeuB/cb19cae67f.png - 1 month

http://puu.sh/nUevS/d62165f1a1.png - young

21 keys:

http://www.tf2outpost.com/trade/27973148 - 6 days

22 keys:

http://puu.sh/nUexr/ddd4bf24c9.png - 13 days

Offers:

http://www.tf2outpost.com/trade/27993023

Buyers:

16 keys: (inside document)

http://puu.sh/nUeX4/7633b1fa52.png

12 keys:

http://www.tf2outpost.com/trade/27078393

http://www.tf2outpost.com/trade/26446184

http://puu.sh/nUeTf/24e08db677.png

11 keys:

http://www.tf2outpost.com/trade/27990323

http://puu.sh/nUeUm/b05ffb22b5.png

The sales:

20 (pure)

18 (pure)

18 (mostly pure)

17 (pure)

16

15

11

Going with the pure sales at 17-20