The Spectators That Stayed Too Long.

https://backpack.tf/item/2925231986

Sale 1) Sold + Bubbling Your Worst Nightmare for a Haunted Ghosts Killer's Kabuto (50 Keys) + ~1 Key of Items

https://backpack.tf/profiles/76561198215559840#!/compare/1496448000/1496620800

http://www.tf2outpost.com/trade/29211863 - Capped by the Buyout of 27 Keys

Sale 2) Sold for a Molten Mallard Caribbean Conqueror + 9 Refined

https://backpack.tf/profiles/76561198160966047#!/compare/1500768000/1500854400

http://www.tf2outpost.com/trade/29291206 - Capped by the Buyout of 27 Keys

Sale 3) Sold for 19 Keys + ~3 Keys of Items

https://backpack.tf/profiles/76561198132226518#!/compare/1501459200/1501545600

19 + 3 = 22 Keys

Sale 4) Sold for a Pro KS Rocket Launcher Kit (~17 Keys) + ~1 Key of Items

https://backpack.tf/profiles/76561198145926906#!/compare/1501545600/1501632000

Low Outlier.

Sale 5) Sold for 23 Keys

https://backpack.tf/profiles/76561198120768380#!/compare/1502668800/1502755200 - Buyer's Backpack

https://backpack.tf/item/210386889

Sale 6) Sold for a Smoking Fruit Shoot (16.5 Keys)

https://backpack.tf/profiles/76561198065600921#!/compare/1500681600/1500940800

Low Outlier.

https://marketplace.tf/items/106;5;u8 - Marketplace sale at ~26 Keys