Knifestorm Dixie, I found you...

Only Sale

http://www.tf2outpost.com/trade/23972116 Sold with Pro KS Aussie Blutsauger for 13th Dead Cone

Knifestorm offered on 13th

X + 1.4 = 3.8

X = 2.4

13th http://backpack.tf/item/1202195884

Knifestorm http://backpack.tf/item/1193624558

Bluts http://backpack.tf/item/2622558196

Mini for Bluts

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Blutsauger Sold for $33.46 on Dec 18th

$33.46 + $33.46*1.15 = $71.94

$71.94/2 = $35.97

Keys were $2.33 on Dec 18th

$35.97/$2.33 = 15.4 keys

Other sale was a Bulk sale for something that was not tracked by backpack.tf