Quack

https://backpack.tf/item/7410576879

Sale 1) Sold for a Stormy 13th Hour Allbrero (195 Keys) + Scorching Flames Burning Question (57 Keys)

https://backpack.tf/profiles/76561198120672630#!/compare/1558137600/1558224000

195 + 57 = 252, which I'll round to 250 Keys

Burning Question Mini

https://backpack.tf/profiles/76561198146168832#!/compare/1562371200/1562457600 - Sold for 57 Keys + 5.55 Refined

https://backpack.tf/profiles/76561198048140234#!/compare/1562457600/1562544000 - Sold for 57 Keys + 6 Refined

https://backpack.tf/profiles/76561198092160716#!/compare/1562457600/1562544000 - The Keys were used to buy the Hunter in Darkness

Allbrero Mini

https://backpack.tf/profiles/76561198041108750#!/compare/1562371200/1562544000 - Sold for a Sunbeams Defragmenting (230 Keys)

https://backpack.tf/profiles/76561198120672630#!/compare/1562457600/1562544000 - Sold + 11 Keys for an Ama Stahl (90 Keys) + MG Hazmat (85 Keys)

Taking 165 - 225 Keys, which averages to 195 Keys

Defragmenting Micro

https://backpack.tf/profiles/76561197978500506#!/compare/1562716800/1562803200 - Sold for a Frostbite DCO (165 Keys) + Duped Peace Pencil (65 Keys)

165 + 60 = 225 Keys

Deep Cover Operator Nano

https://backpack.tf/suggestion/5d38e904d38172139f25056f - 165 Keys

Pencil Nano

https://imgur.com/a/5LqIkRS - Seller at 60 Keys

https://backpack.tf/item/790219326

Nothing else.

Sale 2) Sold + 10 Keys for a Strange Nether Trail Duck-Billed Hatypus (170 Keys) + Scorching Flames Chill Chullo (152 Keys)

https://backpack.tf/profiles/76561198023126936#!/compare/1564099200/1564358400

170 + 152 - 10 = 312, which I'll round to 310 Keys

Chullo Mini

https://marketplace.tf/items/tf2/30748;5;u14 -_ Sold for $275 when Keys were ~$1.81 each

https://marketplace.tf/items/tf2/5021;6

275 / 1.81 = 151.93, which rounds to 152 Keys

Sale 3) Sold + Fountain of Delight Zoomin' Broom + 2 Strange Pro KS Skins for a Strange Haunted Ghosts Co-Pilot

https://backpack.tf/profiles/76561198267226056#!/compare/1564790400/1564963200

https://backpack.tf/profiles/76561198062425416#!/compare/1564876800/1564963200

This would be better used to give the Co-Pilot a range from https://backpack.tf/suggestion/5d2e9049d381722d561a4d10