Shale Oil is Oil formed from the sedimentary rock Shale, which commonly contains organic material. A big reservoir of it was found underneath Oklahoma, it's being mined by 'Muricans. This causes daily tremors and earthquakes in Oklahoma

Sale 1

http://www.tf2outpost.com/trade/27335249 Sold with 2.2 keys of sweets for OF Wraith

B/O for DP was 27

B/O for OF was 26

Presumed DP was offered

X + 2.2 = 26

X = 24

OF http://backpack.tf/item/1661368948

DP http://backpack.tf/item/2611884213

Trade http://backpack.tf/profiles/76561198089741591?time=1446188400&compare=1446451200

Mini for OF

http://backpack.tf/vote/id/5679cbbbb98d88b70ce94ad7 29 keys, using 29

Sale 2

http://www.tf2outpost.com/trade/27166181 Sold for 24 keys

B/O for Wraith was 24

X = 24

Keys http://backpack.tf/profiles/76561197995140817?time=1444978800&compare=1444719600 https://gyazo.com/c3714b040a01391f27d6d4e6f63d8631

Wraith http://backpack.tf/item/2652788985

Sale 3

http://backpack.tf/profiles/76561198126868108?time=1447056000&compare=1447142400 Sold for OF Caribbean, best used to price Caribbean

Seller

http://www.tf2outpost.com/trade/27568850 22 keys