http://www.tf2outpost.com/trade/25741630

Sold for a Phosphorous Lucky Shot (48.5 keys)

http://backpack.tf/profiles/76561198055212602?time=1430031600 (April 26th)

http://backpack.tf/profiles/76561198055212602?time=1430118000 (April 27th)

48.5 * 0.9 = 43.65; rounded to 44 keys

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http://www.tf2outpost.com/trade/25680220

Sold with a S. Pro KS Market Gardener (~4 keys) for a Demonflame Coupe

http://backpack.tf/profiles/76561198086429470?time=1429254000 (April 17th)

http://backpack.tf/profiles/76561198086429470?time=1429426800 (April 19th)

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http://www.tf2outpost.com/trade/25602719

Sold for a Pro KS Aussie Black Box (28.5 keys) + Stormy Defiant Spartan (19.5 keys)

http://backpack.tf/profiles/76561198092995982?time=1428390000 (April 7th)

http://backpack.tf/profiles/76561198092995982?time=1428476400 (April 8th)

(19.5 + 28.5) * 0.9 = 43.2 keys; rounded to 44 keys

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Pro KS Aussie Black Box:

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Black%20Box

~$73-63.5 (28.5 keys) around the time of sale