Sale 1: (Dupe)

Sold for 14 keys

http://www.tf2outpost.com/trade/28347156 - B/O of 14

Seller: http://backpack.tf/profiles/76561198021055079#!/compare/1468800000/1468886400

Buyer: http://backpack.tf/profiles/76561198151819590#!/compare/1468800000/1468886400

http://puu.sh/qrDlj/6c8f768f94.png

http://puu.sh/qrDm6/a725662325.jpg

X = 14

Sale 2:

Sold for Pro. KS Sniper Rifle Kit (~13) + ~5 keys in items

http://www.tf2outpost.com/trade/28357131 - B/O of 14

Seller: http://backpack.tf/profiles/76561198021055079#!/compare/1469577600/1469664000

Buyer: http://backpack.tf/profiles/76561198107217567#!/compare/1469577600/1469664000

http://puu.sh/qrCur/025973493f.png

http://puu.sh/qrCvy/082ba624b7.jpg

X = 14 (Capped by B/O)

Sale 3:

Sold with 2 keys for Green Confetti Batter’s Helm (16)

No outpost

Seller: http://backpack.tf/profiles/76561198091463235#!/compare/1467849600/1467936000

Buyer: http://backpack.tf/profiles/76561198091312461#!/compare/1467763200/1467936000

X = 14

Sellers:

13 keys:

http://puu.sh/qrDtr/aca2381a97.jpg - 10 days, duped

http://backpack.tf/u/76561198072240925

14 keys:

http://puu.sh/qrDun/a88e3a59e2.png - 8 days

http://backpack.tf/u/76561198006544512

http://puu.sh/qrDvr/10d1eb2019.png - 1 month

http://backpack.tf/u/76561198090956917

15 keys:

http://puu.sh/qrDw7/f613eb3cf0.png - 3 days

http://backpack.tf/u/76561198074924284

http://www.tf2outpost.com/trade/28323686 - 3 weeks

3 sales at 14 keys

Not going to include the seller at 13 keys in the range because it is duped.

Going with 14 flat