I sweated to get this done

Sale 1

http://www.tf2outpost.com/trade/27389646 Sold for Harvest Gentleman's Ushanka + MN Festivizer

B/O for Tex was 100

X = 78*0.9 + 19*0.9

X = 87

Ushanka http://backpack.tf/item/1193312947

Festivizer http://backpack.tf/item/3206932530

Tex http://backpack.tf/item/3477397042

Mini for Festivizer

http://backpack.tf/vote/id/56616459b98d88041ce94b34 19 keys, using 19

Sale 2 OUTLIER

http://www.tf2outpost.com/trade/27204458 Sold for 50 pure + Pro KS S. Sydney

Calling an outlier since the sale above and below sold in a day

Sale 3

http://www.tf2outpost.com/trade/27057573 Sold for 64 keys

X = 64

Tex http://backpack.tf/item/3336603561

Keys https://gyazo.com/22c5c6c925ded5e8db04d7e423e7ad6a http://backpack.tf/profiles/76561198036254026?time=1442646000&compare=1442732400

Woifi suggested I use a big range http://backpack.tf/vote/id/566167e0dea9e99f7a7f7713#comment-56616a0edea9e9c17a7f76f1