And there's the final one.

SALE 1

Unknown, looks like scm

https://backpack.tf/profiles/76561198044647015#!/compare/1559952000/1561507200

https://backpack.tf/profiles/76561198034611299#!/compare/1560297600/1560902400

SALE 2

Sold for 9 keys + strange ks gold botkiller rocket launcher mk.ll + 46 refined

https://backpack.tf/profiles/76561198119197768#!/compare/1557446400/1557532800

Rounds to 11 keys

SALE 3

Most likely sold for 11 keys + 12.22 refined

https://backpack.tf/profiles/76561198325528667#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198070142673#!/compare/1557532800/1557619200

Not 100% sure, so not using

SALE 4

Sold for 14 keys

https://backpack.tf/profiles/76561198070142673#!/compare/1557619200/1557705600

https://backpack.tf/profiles/76561198145092459#!/compare/1557532800/1557705600

Purchased it for 14, then dumped it to 13 within a week (sale 5)

SALE 5

Sold for 13 keys + 16 refined

https://backpack.tf/profiles/76561198145092459#!/compare/1558224000/1558310400

Rounds down to 13 keys

Not using as mentioned above in sale 4

SALE 6

Sold (or got scammed)

https://backpack.tf/profiles/76561198210767245#!/compare/1558224000/1558396800

Scammer purchase (or scam)

SALE 7

Bulk for blizzardy federal casemaker

https://backpack.tf/profiles/76561198113276430#!/compare/1561507200/1561680000

SALE 8

Sold for 14 keys + 2 refined

https://backpack.tf/profiles/76561197976392732#!/compare/1563494400/1563580800

Rounds down to 14 keys

SALE 9

Sold for 15 keys

https://backpack.tf/profiles/76561198442349647#!/compare/1563580800/1563667200

SALE 10

Sold for 15 keys

https://backpack.tf/profiles/76561198349886701#!/compare/1558656000/1558742400

SALE 11

Unknown

https://backpack.tf/profiles/76561198369345535#!/compare/1558310400/1559865600

SALE 8

Unknown

https://backpack.tf/profiles/76561198269395083#!/compare/1563580800/1563753600

Classifieds at the time of making this suggestion.

https://gyazo.com/9bfb442a449c6e5e5cc3d4cd04ee0ce7

Sales at 11, 14, 15, and 15. Buyers suggest 11 is low. Taking a range of 14-15 keys here.