Out of all the suggestion trains, I end up here from some Falkirk effect

Sale 1

[No OP Trade] Sold for Aussie Sticky + 5.7 keys of sweets

X = 14 + 5.7*0.9

X = 19

Sticky http://backpack.tf/item/4367632874

Noble http://backpack.tf/item/2276624741

Sale 2

http://www.tf2outpost.com/trade/27439371 Sold for KS Aussie Black Box + 1.5 keys of sweets

B/O for Noble was 20

Box had no trade, presuming offered

X = 20.8*0.9 + 1.5*0.9

X = 20

Box http://backpack.tf/item/4311756712

Noble http://backpack.tf/item/2276624741

Mini for Box

http://steamcommunity.com/market/listings/440/Strange%20Killstreak%20Australium%20Black%20Box Sold for 53.14 on Nov 18th

53.14 + 53.14/1.15 = 99.35

99.35/2 = 49.68

Keys were $2.39 at time of sale

49.68/2.39 = 20.8 keys

Sale 3

http://backpack.tf/profiles/76561198072621007?time=1449561600&compare=1449388800 Bulk for Twatt Rebel

Sale 4

http://www.tf2outpost.com/trade/27440275 Sold for 18 keys

B/O for Noble was 20

X = 18

Keys https://gyazo.com/9537d85e319f472e59fb9154efc6c9c9 http://backpack.tf/profiles/76561198090956917?time=1448870400&compare=1448956800

Noble http://backpack.tf/item/1818518346