BONK

https://backpack.tf/item/1013738009

Sale 1) Sold for 14 Keys

https://backpack.tf/profiles/76561198054945991#!/compare/1523577600/1523750400

https://backpack.tf/item/929434965

Sale 2) Quicksold for 11 Keys

https://backpack.tf/profiles/76561198083047491#!/compare/1525737600/1525910400 - Buyer's Backpack

Sale 3) Sold + 3 Keys + 13 Refined for a Green Confetti Swagman's Swatter

https://backpack.tf/profiles/76561198083047491#!/compare/1525737600/1525910400 - Seller's Backpack

https://backpack.tf/profiles/76561198074178367#!/compare/1525824000/1525910400 - Buyer's Backpack

http://www.tf2outpost.com/trade/29647507 - Capped by the Buyout of 12 Keys

Sale 4) Sold for a Memory Leak Coupe D'isaster (9 Keys) + 4 Keys

https://backpack.tf/profiles/76561198275783474#!/compare/1525996800/1526083200

9 + 4 = 13 Keys

Coupe Mini

https://backpack.tf/profiles/76561198082878780#!/compare/1525737600/1525824000 - Quicksold for 8 Keys + 10.33 Refined

https://imgur.com/a/IgBHs4a - 9 Day Unsold at 9.18 Keys

Taking 9 Keys