History 1: https://backpack.tf/item/10892496856

https://mannco.store/item/440-cavalier-de-carte-unusual-taunt-luxury-lounge

$30 / $1.61 = 18.63 keys ~19 keys, buyout was 15 https://gladiator.tf/listings/61b279713d537982bd68bed0

History 2: https://backpack.tf/item/10754066245

14 keys:

https://backpack.tf/profiles/76561197963500354#!/compare/1640044800/1640131200

https://backpack.tf/profiles/76561198969552371#!/compare/1640044800/1640131200

credit to The Final Frontier for the screenshot https://imgur.com/kxshpGS

History 3: https://backpack.tf/item/10068557666

Bulk for the Spelled Time Warp Birdcage:

https://backpack.tf/profiles/76561198211670637#!/compare/1638144000/1638316800

https://backpack.tf/profiles/76561198823641017#!/compare/1638230400/1638316800

Added a Hollow Flourish Taunt: Runner's Rhythm for 17 keys:

https://backpack.tf/profiles/76561198823641017#!/compare/1638230400/1638316800

https://backpack.tf/profiles/76561198330178519#!/compare/1638316800/1638576000

none had buyouts so can't tell how much was added for which item

History 4: https://backpack.tf/item/9602464202

Untrace:

https://backpack.tf/profiles/76561198223191956#!/compare/1639267200/1639699200

https://backpack.tf/profiles/76561198123389475#!/compare/1639353600/1639699200

History 5: https://backpack.tf/item/7440925947

Bulk for Ancient Specter Towering Patch of Pumpkins:

https://backpack.tf/profiles/76561197961976244#!/compare/1640044800/1640131200

https://backpack.tf/profiles/76561199214948593#!/compare/1640044800/1640131200

Dumped to a bot, 8 keys match:

https://backpack.tf/profiles/76561199214948593#!/compare/1642118400/1642204800

https://backpack.tf/profiles/76561199192088525#!/compare/1642118400/1642204800

Untrace:

https://backpack.tf/profiles/76561199192088525#!/compare/1642204800/1642291200

https://backpack.tf/profiles/76561198265023186#!/compare/1642550400/1643155200

~~

https://marketplace.tf/items/tf2/30922;5;u3061

$29.9 / $1.82 = 16.43 keys ~16 keys

taking 14-16 keys here since 8 was a qs