Haunted Ghosts Tyrant's Helm

https://backpack.tf/profiles/76561198080179568#!/compare/1589846400/1589932800

https://backpack.tf/profiles/76561198300101492#!/compare/1589846400/1590105600

https://bot.tf/stats/listings/Y3WOR52R - sold for 41 keys + Kill-a-Watt Tough Guy's Toque (11.5) = 42 keys b/o (most likely the toque wasn't involved but rather sold to the bot to get the 42 keys to buy it but sale will still be 42)

https://bot.tf/stats/listings/MLV6GKRZ

https://imgur.com/a/FfMlHu0

https://bot.tf/stats/item?def=99&q=5&ef=Haunted+Ghosts&craft=1&aus=0&ks=0

https://backpack.tf/profiles/76561198305494036#!/compare/1587340800/1587427200

https://backpack.tf/profiles/76561198218628708#!/compare/1587427200/1587513600 - sold for 39 keys + 53 ref (40)

https://backpack.tf/profiles/76561198124972076#!/compare/1593907200/1593993600

https://backpack.tf/profiles/76561198889987634#!/compare/1593907200/1594339200 - sold for Sunbeams Magistrate's Mullet (37.5) + Strange Professional Killstreak Ambassador (4) = 42 keys

https://backpack.tf/profiles/76561198065613492#!/compare/1593388800/1593561600

https://steamuserimages-a.akamaihd.net/ugc/1463058338080324397/9F111C0982C4A47632E001B743CDD166928207E5/ - sold with Searing Plasma Exquisite Rack + Massed Flies Bonk Boy + 10 keys for Darkblaze Helmet Without a Home (better to use there)

https://backpack.tf/profiles/76561198059874094#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198065613492#!/compare/1592697600/1592784000 - sold for some amount of keys

https://backpack.tf/profiles/76561198035766915#!/compare/1592611200/1592697600

https://backpack.tf/profiles/76561198059874094#!/compare/1592611200/1592697600 - possibly 37 keys

https://backpack.tf/profiles/76561198061836787#!/compare/1594684800/1595030400 - sold for some amount of keys

Conclusion:

sales at 37?, 40, 42, 42

40 - 42 keys