Credit to Shuffle Spy for the freebie :)

https://backpack.tf/item/10848064630

Sale 1) Sold for 123 Keys + Spectral Shackles Scooty Scoot

https://backpack.tf/profiles/76561198056611628#!/compare/1700438400/1700784000

123 + 6 = 129, which rounds to 130 Keys

Scoot Mini

https://backpack.tf/profiles/76561198850274253#!/compare/1697500800/1697587200 - Sold for 6 Keys

https://backpack.tf/item/10886913899

Sale 2) ?

https://backpack.tf/profiles/76561198132961995#!/compare/1697155200/1697241600

https://backpack.tf/profiles/76561199393293102#!/compare/1697241600/1697328000

Sale 3) ?

https://backpack.tf/profiles/76561199393293102#!/compare/1697760000/1697846400

https://backpack.tf/profiles/76561198210678091#!/compare/1697760000/1697846400

Sale 4) Better for the Ushanka

https://backpack.tf/profiles/76561198210678091#!/compare/1698364800/1698451200

https://backpack.tf/profiles/76561198285371555#!/compare/1698019200/1698451200

Sale 5) Sold + Pro KS 2x Spelled Strange Festive Rocket Launcher for a Lantern TC (200) + 40 Keys

https://backpack.tf/profiles/76561198285371555#!/compare/1698969600/1699142400

Bulky sale.

Sale 6) Sold + GBH Flamenco for a CS Knife

https://backpack.tf/profiles/76561198337378097#!/compare/1700352000/1700438400

Bulky sale.

Sale 7) Sold + Potion Explosion Mannrobics for some quantity of Keys

https://backpack.tf/profiles/76561199051516190#!/compare/1700784000/1700870400

https://backpack.tf/profiles/76561198191854982#!/compare/1700784000/1700870400

Sale 8) Sold for a Prankster Seared Sorcerer + Scorching Arctic Mole + 15 Keys

https://backpack.tf/profiles/76561198191854982#!/compare/1701475200/1701561600

https://imgur.com/a/y2BSfcp

79 + 60 + 15 = 154, which rounds to 155 Keys

Seared Mini

https://marketplace.tf/items/tf2/31143;5;u158 - $159.99 (79 Keys)

Mole Mini

https://backpack.tf/suggestion/6573ddd79a1ec3908f0f423c - The comment makes this 60 Keys

Sale 9) Sold + 70 Keys for a Frostbite Condor Cap

https://backpack.tf/profiles/76561198310972287#!/compare/1701993600/1702080000

https://imgur.com/a/gvGWXPI

Better for the Condor