Brigades

Sale #1

Sold for a KaW Elfin' Deal (~24) + S. Spec Huntsman (~4.7, mini below) + ~0.7 keys worth of sweets + ~0.6 keys worth of metal

Before: http://backpack.tf/profiles/76561198117756599?time=1429338141

After: http://backpack.tf/profiles/76561198117756599?time=1430031600

24 + 4.7 + 0.7 *.9 = 26.5 + 0.6 = 27 keys

Spec Huntsman mini

http://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Huntsman

1 sold for $10.91, Keys were $2.33 at the time

10.91/2.33 = ~4.7 keys

Sale #2

Sold for 13 keys + S. Pro Flamethrower (~9.4, mini below)

Before: http://backpack.tf/profiles/76561198044180589?time=1425196800

After: http://backpack.tf/profiles/76561198044180589?time=1425283200

13 + 9.4 *.9 = 21.5 rounding to 22 keys

Pro Flamethrower mini

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Flame%20Thrower

Closest sale was for $22.62, Keys were $2.42 at the time

22.62/2.42 = ~9.4 keys

Additional and Counter Evidence is always appreciated.

Homework out ヽ༼ຈل͜ຈ༽ﾉ