20 Keys? This is Nuts!

http://backpack.tf/item/1565447007

Sale 1) Sold for a DP Mountain Cap (23) * 0.9 = ~21 Keys

http://backpack.tf/profiles/76561198112003960?time=1439708400&compare=1440054000

Mountain Cap Mini

http://backpack.tf/profiles/76561198124417626?time=1441090800&compare=1441177200 --- Sold + 2 Keys + 1 Key in Items for a Black Max's (28.5)

http://www.tf2outpost.com/trade/26938617 - 23 (Unsold for a week). Credits to Lord Scrubbington the III

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Sale 2) Sold for a Terror-Watt Liquidator's Lid (23) * 0.9 = ~21 Keys

http://backpack.tf/profiles/76561197999889701?time=1436166000 (July 6th)

http://backpack.tf/profiles/76561197999889701?time=1436252400 (July 7th)