Sale 1:

Sold with a Stormy Storm Glasgow Great Helm for a The Ooze Brotherhood of Arms

(313*0.9) - 23 = 269.7 rounding to 270 keys

http://www.tf2outpost.com/trade/25741369

Before: http://backpack.tf/profiles/76561198067128023?time=1429599600

After: http://backpack.tf/profiles/76561198067128023?time=1429772400

Sale 2: (outlier, quicksell)

Sold for a Stormy 13th Hour Prince Tavish's Crown, 2 buds, a Prof. Australium Grenade Launcher and a Prof. Australium Stickybomb Launcher (buds were 6)

(108 + 39 + 26)*0.9 + 12 = 167.7 rounding to 170 keys

http://www.tf2outpost.com/trade/25678228

Before: http://backpack.tf/profiles/76561198108388721?time=1428822000

After: http://backpack.tf/profiles/76561198108388721?time=1428908400

There have been higher offers on the outpost trade of the other sellers and this also sold fast. So calling this an outlier / quicksell.

Notes:

Mini for the Crown:

It + 2 other unusuals sold for a Flies TC. After math it values this hat at less than 0 keys.

Capping at 0 keys before it goes negative

Before: http://backpack.tf/profiles/76561198043444428?time=1426748400

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

Only other sale I could use as a mini:

Sold for a It's A Secret To Everybody Master's Yellow Belt

http://www.tf2outpost.com/trade/24032498

(239*0.9) = 215.1 rounding to 215

Severely outdated and no recent sales for a mini min

Although if you take the average between those two sales (0 and 215), it comes out to the current price(108)!! So I’m just using to current price (108).

Mini for the Prof. Australium Grenade Launcher:

1 sold on the SCM for $94.30 the day before the sale

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Grenade%20Launcher

(94.3/2.4) = 39.2916667 rounding to 39 keys

Mini for the Prof. Australium Stickybomb Launcher

1 sold on the SCM for $62.83 on the day of the sale

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Stickybomb%20Launcher

(62.8/2.4) = 26.1666667 rounding to 26 keys

Conclusion:

Outlier at 170 and one sale at 270, taking the price at 270 keys.