Thanks Polar for the advice!

Sale 1:

Sold for a Harvest Toque

http://backpack.tf/profiles/76561198042251117?time=1443510000

http://backpack.tf/profiles/76561198042251117?time=1443682800

http://backpack.tf/profiles/76561198042251117?time=1443510000&compare=1443682800

Shaman - http://backpack.tf/item/2567447475 | Toque - http://backpack.tf/item/1226812515

x = 94 x 0.9

= 85 Keys

Sale 2:

Sold with KS Festivizer + Mallard Private Eye for Smoking Viewfinder

http://backpack.tf/profiles/76561198042251117?time=1443682800

http://backpack.tf/profiles/76561198042251117?time=1443942000

http://backpack.tf/profiles/76561198042251117?time=1443682800&compare=1443942000

Bulk sale, not usable

Sellers/Classifieds:

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

x1 68 Keys - 4 Months

x1 80 Keys - 8 Days

x1 88 Keys - 5 Days

~~~ http://www.tf2outpost.com/trade/25554373 - 90 Keys - 6 Months

Conclusion:

1 Valid sale at 85 Keys Pure and a seller at 68 Keys, taking a range of 68-85 Keys