item1:

https://backpack.tf/item/5135266387

sale1:

https://backpack.tf/profiles/76561198154586549#!/compare/1692921600/1693872000

https://backpack.tf/profiles/76561198047426996#!/compare/1693612800/1694390400

Arcane Assistance Taunt: The Proletariat Posedown = Prismatic Haze Taunt: Scotsmann's Stagger

Prismatic Haze Taunt: Scotsmann's Stagger:

https://marketplace.tf/items/tf2/30840;5;u3097

30 keys high

sale2:

https://backpack.tf/profiles/76561198047426996#!/compare/1694563200/1694736000

https://backpack.tf/profiles/76561198141685007#!/compare/1694476800/1694563200

bulk to Burning Flames Towering Titanium Pillar of Hats

sale3:

https://backpack.tf/profiles/76561198141685007#!/compare/1694649600/1694736000

https://backpack.tf/profiles/76561199213304560#!/compare/1694563200/1694649600

21 keys

sale4:

https://backpack.tf/profiles/76561198141685007#!/compare/1694649600/1694736000

11 keys

https://marketplace.tf/items/tf2/30616;5;u3039

sale1:

2023-08-28

34.99/2.007=17.43398

17 keys

30>21>11, 17

Mindacos:

You used the wrong link for the 11 sale. Except it didn't sell for 11 either, it sold for 10:

https://backpack.tf/profiles/76561199213304560#!/compare/1694649600/1694736000

https://backpack.tf/profiles/76561198062077976#!/compare/1693958400/1694995200

I don't fully agree with including this sale. Even though 30 and 21 are clearly high, outliers go both ways. 17 flat should be fine here.