Right.

Sales

Sale 1: Sold for 9 keys~

https://backpack.tf/profiles/76561198341171690#!/compare/1596326400/1596412800

https://backpack.tf/profiles/76561198055472632#!/compare/1579737600/1600300800

https://bot.tf/stats/item?def=291&q=5&ef=Aces%20High&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/089f555c19a1b4a94a340bd2a7cbf743

Sale 2: Untrace/Bulk

https://backpack.tf/profiles/76561198953299555#!/compare/1598486400/1598572800

https://backpack.tf/profiles/76561198021055079#!/compare/1598400000/1598486400

Sale 3: Probably added something for Strange Specialized Killstreak Australium Tomislav?

https://backpack.tf/profiles/76561198002757046#!/compare/1593302400/1593388800

https://backpack.tf/profiles/76561198953299555#!/compare/1593216000/1593388800

B/o was 9.5 keys~

https://bot.tf/stats/listings/4R06OPZ9

Sale 4: Sold for 11 keys

https://backpack.tf/profiles/76561198021055079#!/compare/1600560000/1600732800

https://bot.tf/stats/listings/MQ0OL702

Other exchanges with scrap and stn.

https://backpack.tf/item/7956014962

https://backpack.tf/item/7956561881

Marketplace

https://marketplace.tf/items/tf2/291;5;u59

July

$21.11 on July 27 (21.11/1.92 = 11~)

https://manic.tf/keyprice/?at=2020-07-27

22 on July 30 (22/1.92 = 11~)

https://manic.tf/keyprice/?at=2020-07-30

August

$20.99 on August 6 (20.99/1.85 = 11~)

https://manic.tf/keyprice/?at=2020-08-06

23 on August 13 (23/1.84 = 12.5 rounding to 13 keys)

https://manic.tf/keyprice/?at=2020-08-13

11.3 on August 20 (11.3/1.79 = 6.31 rounding to 6.5 keys)

Classifieds

https://gyazo.com/28117eae274058da38a727aec9cf2732

Summary

Sales at 9 and 11. Unconfirmed buyout at 9.5.

Marketplace sales at 6.5, 11, 11, 11, and 13.

Conclusion

Excluding 6.5, 9 and 9.5 due to buyers.

Excluding 13 as it seems higher than the other sales, and including it would make this a raise, and with 3 sales at lower that are being excluded, that does not seem like the best choice.

Going with 11 here.