I could only find marketplace.tf sales.

Idk histories

https://marketplace.tf/items/tf2/30021;5;u60

https://marketplace.tf/items/tf2/5021;6 (key prices for reference)

7th is still indate.

2x15.99, on of them on 7th of Aug, while the other one was sold on 28th of Aug.

I can't actually find what keys were sold on marketplace on the 7th its not showing up so if anyone has any idea how to check it lmk but yeah I doubt they differed that much, last data I can read is 10th and keys were 1.81$ ea from then for over a month so...

15.99/1.81=8.83k so 9k

At least one sale is 9k, other one would be the same im pretty sure but yeah