Credits to Shuffle Spy:

https://imgur.com/a/JGSJwou + https://backpack.tf/item/10938442837 - Sold for $25.01

This is ~12 Keys, so 11 - 12 would work.

https://backpack.tf/item/7957363697

https://backpack.tf/profiles/76561199111073161#!/compare/1633651200/1633737600

https://backpack.tf/profiles/76561198873018311#!/compare/1633737600/1633824000

https://gladiator.tf/listings/61614f4de175394d82d11969

untrace, but snapshot suggests ~12k

https://backpack.tf/profiles/76561198873018311#!/compare/1633824000/1633996800

TW bumble beanie + stuff matches, most likely bulk

https://backpack.tf/profiles/76561199110809353#!/compare/1634774400/1634860800

https://gladiator.tf/listings/6172362610210da21f1795bf

although this sale isn't technically traceable, the snapshot above shows the dixie being listed than the highest buy order by bender, which now owns the hats. so most probably, someone bought from christian, then instantly sold to bender buy order, both at ~11k

https://backpack.tf/item/7956660602 - move to MP

11-12 as per Shuffle Spy's comment.