So... manhunt...

https://backpack.tf/item/5438608503

Sale) Sold for a Scorching Flames Frontier Djustice (186.25 Keys) + ~80 Keys of Unusuals and Australiums

https://backpack.tf/profiles/76561198125791160#!/compare/1492473600/1492560000

186.25 + 80 = 266.25, which rounds to 266 Keys

Djustice Mini

https://backpack.tf/profiles/76561198094428372#!/compare/1492041600/1492128000 - Sold for a Burning Flames Tyrant's Helm (186.25 Keys)

Tyrant's Micro

https://backpack.tf/profiles/76561198065044765#!/compare/1488672000/1488758400 - Sold for 150 Keys

http://www.tf2outpost.com/trade/28708536 - Took 2 Months

https://backpack.tf/profiles/76561198075998447#!/compare/1488931200/1489017600 - Sold for a Scorching Flames Backwards Ballcap (200 Keys)

https://backpack.tf/profiles/76561198075998447#!/compare/1489190400/1489363200 - Sold for a Scorching Flames Pot (142.5 Keys) + FN Hot Aqua (80 Keys)

Taking 150 - 222.5, which is 186.25 Keys.