Item 1: https://backpack.tf/item/5243996214

Sale 1:

https://backpack.tf/profiles/76561199139085248#!/compare/1753142400/1753228800

https://backpack.tf/profiles/76561198159858941#!/compare/1712793600/1753228800

9 keys

Item 2: https://backpack.tf/item/9944033561

Sale 2:

Mannco, ignoring

Sale 3:

https://backpack.tf/profiles/76561198437037170#!/compare/1750550400/1752710400

https://backpack.tf/profiles/76561198311498888#!/compare/1750550400/1750636800

Dump to STN, no match

Sale 4:

https://backpack.tf/profiles/76561198311498888#!/compare/1753056000/1753142400

https://backpack.tf/profiles/76561198387959913#!/compare/1747872000/1754179200

9 keys 1.66 ref, rounds to 9

Item 3: https://backpack.tf/item/6740946285

Sale 5:

https://backpack.tf/profiles/76561198961851709#!/compare/1749772800/1751932800

https://backpack.tf/profiles/76561198172611838#!/compare/1749600000/1750204800

SCM, compare dates are too wide to tell which sale it was

Sale 6:

https://backpack.tf/profiles/76561198172611838#!/compare/1750377600/1750464000

https://backpack.tf/profiles/76561199127409503#!/compare/1750464000/1750550400

8 keys 16 ref, bot dump (~8.5 keys)

Sale 7: Mannco, ignoring

Marketplace.tf: https://marketplace.tf/items/tf2/1162;5;u3001

Key prices: https://marketplace.tf/items/tf2/5021;6

Item 4: https://backpack.tf/item/15257514740

Sale 8:

Sold for $22.55 on June 29 2025

Keys were $2.01

22.55/2.01=11.22 ~11 keys

Sale 9:

Sold for $22.55 on July 17 2025

Keys were $2.01

22.55/2.01=11.22 ~11 keys

Sale 10:

Sold for $22.55 on July 31 2025

Keys were $1.94

22.55/1.94=11.62 ~12 keys

Sales:

8.5, 9, 9, 11, 11, 12

Sellers:

BPTF - https://imgur.com/s8y4zPA 2 at 11.57 (28 days and 6 months)

MPTF - https://marketplace.tf/items/tf2/1162;5;u3001 $22.55 (~12 keys)

STN - https://stntrading.eu/item/tf2/Unusual%20Showstopper%20Taunt:%20Mannrobics none

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Mannrobics?filter=Showstopper https://imgur.com/a1Af3oW 171€

8.5 was a bot dump and is around buyer's price so excluding. Even though technically 11.57 rounds to 12, the fact that one of the pure sellers has been there for 6 months makes me believe that it's near impossible to get 12 keys pure for it. For this reason, I think 12 should also be excluded. 9-11 seems to be the most common trading point so going with that with an outlier on each end.