History 1: https://backpack.tf/item/5334661069

15 keys + Most Wanted Unusualifier + Pyr'o Lantern + Buds:

https://backpack.tf/profiles/76561198061440669#!/compare/1661299200/1661472000

https://backpack.tf/profiles/76561198066685581#!/compare/1661126400/1661385600

Unusualifier was ~2 keys at the time https://gladiator.tf/sales?item=Non-Craftable%20Unusual%20Taunt:%20Most%20Wanted%20Unusualifier&at=2022-08-22T07:34:15.003Z

Lantern was ~1 key 48 ref (rounding to 2 keys) https://gladiator.tf/sales?item=Pyr%27o%20Lantern&at=2022-08-22T07:36:10.158Z

Buds were ~7 keys https://gladiator.tf/sales?item=Earbuds&at=2022-08-22T07:36:50.761Z

15+2+2+7=26 keys, caps at the 24 key buyout https://gladiator.tf/time-machine?item=Haunted%20Ghosts%20Slick%20Cut&at=2022-08-24T07:41:09.000Z

History 2: https://backpack.tf/item/2240219873

24 keys:

https://backpack.tf/profiles/76561199084282838#!/compare/1658707200/1658793600

https://backpack.tf/profiles/76561198091213495#!/compare/1658793600/1658880000

Untrace but sold to a bot:

https://backpack.tf/profiles/76561198091213495#!/compare/1661731200/1662508800

https://backpack.tf/profiles/76561199102430997#!/compare/1662422400/1662508800

~~

https://gladiator.tf/sales?item=Haunted%20Ghosts%20Slick%20Cut&at=2022-10-15T07:39:32.657Z 2 buy order sales at ~22 keys

https://marketplace.tf/items/tf2/30187;5;u8 $53.9/1.95=27.64 ~28 keys

~~

Sales at 22, 22, (untraceable buy order sale), 24, 24, 28

https://backpack.tf/item/2240219873 unsold at ~25 keys for 27 days (the 6 month old listing is due to a glitch, it sold for 24 keys as seen above)

28 is definitely high here. Buyers are down to 17 and 22 seems to be a common trading point since 3 sales happened around that. Going to go with 22-24 keys for now