Mini for Misty Skull El Jefe and Poisoned Shadows Tough Guy's Toque.

Sale 1:

https://backpack.tf/item/3134824843

https://backpack.tf/profiles/76561198124510043#!/compare/1602720000/1602806400

https://backpack.tf/profiles/76561198125791160#!/compare/1602720000/1602806400

1:1 with Misty Skull El Jefe. This sale is being used to price that item.

Sale 2:

https://backpack.tf/item/3134824843

https://backpack.tf/profiles/76561198124510043#!/compare/1603929600/1604016000

https://backpack.tf/profiles/76561198171447086#!/compare/1603929600/1604016000

Sold + 90 keys for Poisoned Shadows Tough Guy's Toque. This sale is being used to price that item.

Sale 3:

https://backpack.tf/item/3134824843

https://backpack.tf/profiles/76561198171447086#!/compare/1604361600/1604448000

https://backpack.tf/profiles/76561198209640976#!/compare/1604448000/1604534400

Untraceable. None of the removed keys, nor the unusual, ever see the seller's inventory.

Sale 4:

https://backpack.tf/item/3134824843

https://backpack.tf/profiles/76561198209640976#!/compare/1605052800/1605139200

https://backpack.tf/profiles/76561198037484203#!/compare/1605052800/1605139200

Sold for a duplicated Darkblaze Stately Steel Toe + a duplicated Frostbite Ye Oiled Baker Boy.

Valuing the duplicated Darkblaze Stately Steel Toe at 86+25=111, rounded to 110.

Valuing the duplicated Frostbite Ye Oiled Baker Boy at 55 keys.

Valuing the Neckwear Headwear at 110+55=165 keys.

Mini for duplicated Darkblaze Stately Steel Toe:

https://backpack.tf/item/2057710978

https://backpack.tf/profiles/76561198220098345#!/compare/1603411200/1603497600

https://backpack.tf/profiles/76561198867661640#!/compare/1603065600/1603497600

Sold for Cloudy Moon Scotch Bonnet + 25 keys.

Micro for Cloudy Moon Scotch Bonnet:

Two in-date sales: https://marketplace.tf/items/tf2/306;5;u38

Nov 7: $169.99 - $169.99 / $1.81 = 93.92 keys (rounding to 94)

Sep 15: $144.99 - $144.99 / $1.86 = 77.95 keys (rounding to 78)

Taking range of 78-94 keys, or 86 keys.

Valuing the duplicated Darkblaze Stately Steel Toe at 86+25=111, rounded to 110.

Mini for duplicated Frostbite Ye Oiled Baker Boy:

https://backpack.tf/item/3273518903

https://tinyimg.io/i/iqPfvI0.png (credit to BlazingHailfire)

https://backpack.tf/profiles/76561198209640976#!/compare/1606176000/1606089600

https://backpack.tf/profiles/76561198883610801#!/compare/1606089600/1606176000

Sold for 55 keys.

Conclusion:

Two of the sales are being used to price different hats because they were either the only sale for that hat, or because keys were added alongside this hat for the other, meaning the other hat is more naturally priced with the sale (no need to get the value of a hat and then subtract key value). The third sale is untraceable, and the fourth is for 165 keys. Using that as the price.