Credits to Mindacos!

Miami Nights Bonk Boy

Quicksold for 42 Keys

https://backpack.tf/profiles/76561198197828049#!/compare/1512086400/1512172800

Sold for an Australium Pro KS Sniper Rifle(~35 Keys) and ~14 Keys in Sweets(49 Keys total)

https://backpack.tf/profiles/76561198351299890#!/compare/1512345600/1512432000

Quicksold for 36 Keys

https://backpack.tf/profiles/76561198326093863#!/compare/1514505600/1514592000

Sold for $100 on Marketplace(~51 Keys using 1.97 value)

https://marketplace.tf/items/451;5;u61

Quicksold for 40 Keys

https://backpack.tf/profiles/76561198025560677#!/compare/1507852800/1507939200

Sold for 51 Keys

https://backpack.tf/profiles/76561198062983803#!/compare/1509926400/1510444800

Sold for a Green Energy Fed-Fightin' Fedora(48 Keys) and ~6 Keys in Sweets(54 Keys total)

https://backpack.tf/profiles/76561198190577279#!/compare/1507420800/1507507200

Sold for a Flaming Lantern Ye Olde Baker Boy(35 Keys), an Amaranthine Conquistador(33 Keys) and 10 Keys(78 Keys total, Outlier)

https://backpack.tf/profiles/76561198021055079#!/compare/1512777600/1512864000

49-54.