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Sale 1:
https://backpack.tf/profiles/76561198059726726#!/compare/1628380800/1628467200
https://backpack.tf/profiles/76561198255764866#!/compare/1628294400/1628380800
Untrace / Bulk
Sale 2:
https://backpack.tf/profiles/76561198255764866#!/compare/1631145600/1631232000
https://backpack.tf/profiles/76561198255764866#!/compare/1631145600/1631232000
= 11 Keys. (buyer sold Strange Specialized Killstreak Australium Rocket Launcher and used the keys)
Sale 3:
https://backpack.tf/profiles/76561199106217370#!/compare/1627430400/1627516800
https://backpack.tf/profiles/76561198280524116#!/compare/1627430400/1627516800
= 9 Keyts.
Sale 4:
https://marketplace.tf/items/tf2/30182;5;u34 - Jul 29
$21.99 / $1.81 = 12.15 keys
= 12 Keys.
Sales: 9, 11, 12
Going with 9-12 keys.
You suggested 9-11 instead of 9-12, but...
https://gladiator.tf/listings/6102337fd75ec0e12b1f46f9 ----- it was available for 9 when it sold for 12 on marketplace
So this is fine.