Sale 1:

Sold for Spec. KS Aussie Scattergun (26)

No outpost

Seller: http://backpack.tf/profiles/76561198078666051#!/compare/1480291200/1480377600

Buyer: http://backpack.tf/profiles/76561198090694350#!/compare/1480291200/1480377600

X = 26

Sale 2:

Quicksold for 22 keys

No outpost

Seller: http://backpack.tf/profiles/76561198324627665#!/compare/1479427200/1479513600

Buyer: http://backpack.tf/profiles/76561198304009353#!/compare/1479427200/1479513600

X = 22

Sale 3:

Quicksold for 20 keys

Seller: http://backpack.tf/profiles/76561198066700048#!/compare/1479254400/1479340800

Buyer: http://backpack.tf/profiles/76561198305767884#!/compare/1479254400/1479340800

Sale 4:

Sold for Starstorm Insomnia Nasty Norsemann + Strange Winter Woodsman (<0.5)

Seller: http://backpack.tf/profiles/76561198156315732#!/compare/1479168000/1479254400

Buyer: http://backpack.tf/profiles/76561198066700048#!/compare/1479168000/1479254400

Being used to price the Norsemann

Sellers:

26 keys:

http://i.imgur.com/B8N7DQp.png

http://backpack.tf/u/76561197960906194

http://www.tf2outpost.com/trade/28550797 - 1 month

Sales at:

26

22

20

Excluding 22 and 20, as they are quicksells.

Going with 26