https://marketplace.tf/items/tf2/671;5;u8 - $109.99 (59 Keys) and $95 (50 Keys)

Your ? sale was the Bomber + Aces Stuntman + ~5 Keys of Items + 4 Keys for a Wicked Wood Chill Chullo (no other sales)

https://backpack.tf/profiles/76561199207750538#!/compare/1729296000/1729382400

Other sales:

https://backpack.tf/profiles/76561198090409013#!/compare/1726617600/1729036800 - 33 Keys

https://backpack.tf/profiles/76561198141187659#!/compare/1728950400/1729036800 - Got multiple hats

https://backpack.tf/profiles/76561198046264916#!/compare/1729036800/1729123200 - 54 Keys

https://backpack.tf/profiles/76561198046264916#!/compare/1729123200/1729209600 - Miami Nights Buccaneer's Bicorne

https://backpack.tf/profiles/76561198143196328#!/compare/1729209600/1729468800 - ?

https://backpack.tf/profiles/76561198141187659#!/compare/1729296000/1729382400 - ?

https://backpack.tf/profiles/76561199121570582#!/compare/1730937600/1731110400 - 41 Keys + 33.77 Refined

https://backpack.tf/profiles/76561198380634252#!/compare/1731196800/1731283200 - Bulk sale for 433 Keys

The Bicorne has a sale at $99.99 (54 Keys) - https://backpack.tf/item/12200872667 + https://marketplace.tf/items/tf2/607;5;u61

Currently, there's a seller for 50 Keys - https://backpack.tf/item/2601297008 + https://imgur.com/a/Dc1efsV

The Conjurer's sale will be high here, but the 54 Key sale in my comment serves as an acceptable replacement. The 59 Key MP sale will also be high.