History 1: https://backpack.tf/item/9285210284

70 keys:

https://backpack.tf/profiles/76561198209640976#!/compare/1611446400/1611532800

https://backpack.tf/profiles/76561198063054044#!/compare/1611532800/1611619200

History 2: https://backpack.tf/item/9283100490

Untraceable:

https://backpack.tf/profiles/76561198297526222#!/compare/1608768000/1609891200

https://backpack.tf/profiles/76561198123789684#!/compare/1609027200/1609286400

45 keys + Strange Australium SMG:

https://backpack.tf/profiles/76561198123789684#!/compare/1610668800/1610755200

https://backpack.tf/profiles/76561198080159720#!/compare/1610668800/1610755200

The SMG was priced recently at 10.2 keys. 10.2+45=~55 keys

Buyout was 65, doesn't cap https://gladiator.tf/listings/6000b584621088d481815876

Added a Mirthful Mistletoe Professional's Pom Pom and 50 keys for a Harvest Moon Counterfeit Billycock

https://backpack.tf/profiles/76561198080159720#!/compare/1612742400/1612828800

https://backpack.tf/profiles/76561198220121581#!/compare/1612742400/1612828800

Better used for the Billycock because it only has one recent sale https://backpack.tf/item/3134131383

52 keys match in seller's compare, only 35 match in buyer's:

https://backpack.tf/profiles/76561198220121581#!/compare/1613001600/1614038400

https://backpack.tf/profiles/76561198047468836#!/compare/1613433600/1614038400

History 3: https://backpack.tf/item/9232627177

55 keys:

https://backpack.tf/profiles/76561198122107265#!/compare/1606694400/1606780800

https://backpack.tf/profiles/76561198111437100#!/compare/1606435200/1606780800

History 4: https://backpack.tf/item/9157233396

Untraceable, nothing matches in buyer's compare:

https://backpack.tf/profiles/76561198067663328#!/compare/1611014400/1611100800

https://backpack.tf/profiles/76561198149211008#!/compare/1611014400/1611100800

Added items for the Double Spelled Non-Craftable Summer Hat:

https://backpack.tf/profiles/76561198149211008#!/compare/1612051200/1612137600

https://backpack.tf/profiles/76561198040367777#!/compare/1612051200/1612137600

Can't use this sale because the Summer hat doesn't have any other recent sales https://backpack.tf/item/359517093

Sales at 52, 55, 55, 70

There's an unsold at 70 for 3 months, but it's an add to trade and not regularly bumped https://backpack.tf/item/9250023822

Let's go with 52-70

A seller at 59 appeared https://backpack.tf/item/9284721657

I'll wait for a mod comment, but 52-55 might be more reasonable here