Arthur brewed a storm with his empire?

or was that Lancelot with Guinevere?

Sale 1) Sold + Ooze Letch (Unpriced) for a Duped Misty Yellow Belt (96.5) * 0.9 = ~87 Keys --- Likely Outlier, this is without pricing the Letch

http://backpack.tf/profiles/76561198053966696?time=1425970800

~~~ http://backpack.tf/profiles/76561198013335845?time=1427466834 --- Belt sold for Mallard Screamin' (68) + Max (28.5) = 96.5

Sale 2) Sold for Duped Vivid Modest (~67) - No overpay

http://backpack.tf/profiles/76561197976353061?time=1426098110

~~~ http://backpack.tf/profiles/76561198063564020?time=1430118000 --- Modest sold for 40 Keys + Max (26.5)

Sale 3) Sold for a Flies TC (81) * 0.9 = ~73 Keys

http://backpack.tf/profiles/76561198043444428?time=1426834800

Sale 4) Sold + Pro KS Aussie Grenade (~26 Keys on SCM) + Pro KS Aussie Stickybomb (~21 Keys) + 2 Buds (11.5) for a Spellbound Muffs (245)

http://backpack.tf/profiles/76561198067128023?time=1428735600

X + (58.5 * 0.9 = ~53) = 245 ||| X = 192 Keys

Sale 5) Sold for a Stormy 13th Gutenkutteharen (47) * 0.9 = ~42 Keys

http://backpack.tf/profiles/76561198108388721?time=1429167600

~~~ http://backpack.tf/profiles/76561198108388721?time=1429167600 --- Guten sold for a Frostbite Greased (47)

~~~~~~ http://backpack.tf/profiles/76561198036255543?time=1429513200 --- Greased sold for AF Dead Cone (34) + Logo Coupe (13)

~~~~~~~~~ http://backpack.tf/profiles/76561198036255543?time=1430722800 --- Logo Coupe sold for Searing Coupe (13)

Sale 6) Idk

http://backpack.tf/profiles/76561198043037498?time=1431500400

Sale 7) Sold for a Steaming Law

http://backpack.tf/profiles/76561198129564285?time=1431846000

~~~ Can't get a Mini for the Law, ignoring this sale

Sale 8) Sold for DaD Pampered (58.5) + P. Fetti Napper's (24.5) + C9 Sober (14) = 97 * 0.9 = ~87 Keys

http://backpack.tf/profiles/76561198095978983?time=1432407801

~~~ http://backpack.tf/profiles/76561198095978983?time=1432901624 --- Napper's sold for a C9 Harmburg (24.5)

~~~ http://backpack.tf/profiles/76561198095978983?time=1432556272 --- Sober sold for a Killstreak Aussie FaN (~14)

Sale 9) Sold for a Duped Burning Milkman (115) - overpay applied

http://backpack.tf/profiles/76561198090457223?time=1432623600

~~~ http://backpack.tf/profiles/76561198095742882?time=1426944003 --- Milkman sold for Beams Thirst (92 * 0.9 = ~83) + PE Gonzilla (32)

~~~~~~ http://backpack.tf/profiles/76561198095742882?time=1427526000 --- Gonzilla sold for 4 Buds (32)

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Summary

X < 87

67

73

192 - Outlier

42 - Outlier

87

115 - Outlier

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Going with the centralized sales.