I do hope I get this right...

Sale #1:

Sold for a Phosphorous Lucky Shot + Scorching Noble

49 + 127 * 0.9 = 158.4 keys rounding to 158 keys

http://backpack.tf/profiles/76561198046487200?time=1426180454

http://backpack.tf/profiles/76561198046487200?time=1426489200

Sale #2:

Sold with a Heart Mancers + clean max (36) for a Searing KE

450 - 120 * 0.9 - 36 = 261 keys

Not including in range, calling a high outlier.

http://backpack.tf/profiles/76561198024925599?time=1426662000

http://backpack.tf/profiles/76561198024925599?time=1426748400

Sale #3:

Sold with 5 keys + Scorching Sensei + Burning Rack for a Something Burning Rack + Chiroptera Venenata Rack

Not using, pretty complex, and unable to obtain a suitable mini for the unpriced rack.

http://backpack.tf/profiles/76561198027821803?time=1430879525

http://backpack.tf/profiles/76561198027821803?time=1430895600

Sale #4 (credits to Roller):

Bought for Anti-Freeze Muffs ~215 Keys

Offered on, no overpay.

http://www.tf2outpost.com/trade/25810273

http://backpack.tf/profiles/76561198012300299?time=1430031600

http://backpack.tf/profiles/76561198012300299?time=1430118000

Gotta find my corner, of the sky...