http://www.tf2outpost.com/trade/25680783

Sold with a Bill's (2.5 keys) + a High Five Taunt (0.5 keys) for a Searing Modest

http://backpack.tf/profiles/76561198028533587?time=1428908400 (April 13th)

http://backpack.tf/profiles/76561198028533587?time=1429254000 (April 17th)

(91 * 0.9) - 3 = 79 keys

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http://www.tf2outpost.com/trade/25241178

Sold for a Haunted Phantasm Jr Grenadier's Softcap (43.8 keys) + TF Logo Exquisite Rack (45 keys) + 1 key

http://backpack.tf/profiles/76561198156033886?time=1426316400 (March 14th)

http://backpack.tf/profiles/76561198156033886?time=1426402800 (March 15th)

((43.8 + 45) * 0.9) + 1 = 81 keys

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http://www.tf2outpost.com/trade/25384565

Sold with a Kill-a-Watt Human Cannonball (24 keys) for a duped Burning Noble (108 keys)

http://backpack.tf/profiles/76561198134438595?time=1427612400 (March 29th)

http://backpack.tf/profiles/76561198134438595?time=1427785200 (March 31st)

Duped Burning Noble: http://www.tf2outpost.com/trade/25448114

108 - 24 = around 84 keys

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Duped Burning Noble Mini: http://www.tf2outpost.com/trade/25100325 Sold for 6 buds + 36 keys; ~108 keys

KaW Human Cannonball Mini: http://www.tf2outpost.com/trade/25118954 2 bud B/O for 1 month; ~24 keys

—

Taking the sales at 79 and 81 and rounding to 80 keys. The sale involving the Noble should be pretty close.