resgt, thanks xergo, but buyers are also back :P

sales

sold for 10 keys

https://backpack.tf/profiles/76561198125791160#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198337734785#!/compare/1589241600/1589328000

https://prnt.sc/tt9pks (thanks xerg/dedandrei for screenshots)

https://imgur.com/a/TqpbizP

Untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1591574400/1591660800

https://backpack.tf/profiles/76561198125726631#!/compare/1591574400/1591660800

Sold for 11?

https://backpack.tf/profiles/76561198125726631#!/compare/1591660800/1591747200

https://backpack.tf/profiles/76561198100484031#!/compare/1591660800/1591747200

Histories nor ID's match

Sold for 9 keys

https://backpack.tf/profiles/76561198311498888#!/compare/1592870400/1592956800

https://backpack.tf/profiles/76561198407226837#!/compare/1592870400/1592956800

Untrace

https://backpack.tf/profiles/76561198081792896#!/compare/1592438400/1593907200

https://backpack.tf/profiles/76561198311498888#!/compare/1592352000/1592438400

mptf

https://marketplace.tf/items/tf2/30360;5;u58

24.44 on June 10 (24.44/2.01 = 12.16 rounds to 12)

https://manic.tf/keyprice/?at=2020-06-10

24 on July 20 (24/1.95 = 12.31 rounds to 12)

https://manic.tf/keyprice/?at=2020-07-20

https://backpack.tf/item/8918131362

classifieds

https://gyazo.com/e0d2738784644eb64a6850b3f616787b

Buyers ranging from 6 to 9.75~ keys

summary

1 @ 9

1 @ 10

2 @ 12

conclusion

going with 10-12 as 9 is considered a low outlier due to buyers.