Got a little distracted.

SALE 1

https://backpack.tf/profiles/76561198150163450#!/compare/1560297600/1560384000

SALE 2

sold for 10 keys

https://backpack.tf/profiles/76561198140565712#!/compare/1560556800/1560643200

https://backpack.tf/profiles/76561198429755354#!/compare/1560384000/1560643200

SALE 3

sold for clairvoyance highway star

https://backpack.tf/profiles/76561198093707809#!/compare/1556150400/1556928000

mini for highway star

https://backpack.tf/suggestion/5d353ee16780724bb0661551

taking 13 keys

SALE 4

sold for 9 keys

https://backpack.tf/profiles/76561198311498888#!/compare/1558051200/1558137600

SALE 5

sold for strange festivized professional ks australium smg

https://backpack.tf/profiles/76561198153845654#!/compare/1558310400/1558396800

9.9 rounding to 10 keys

SALE 6

sold for 9 keys

https://backpack.tf/profiles/76561198277409359#!/compare/1558396800/1558483200

SALE 7

sold for 9 keys

https://backpack.tf/profiles/76561198798679682#!/compare/1559433600/1559520000

https://backpack.tf/profiles/76561198054342002#!/compare/1559433600/1559520000

key histories match up

SALE 8

unknown

https://backpack.tf/profiles/76561198798679682#!/compare/1559433600/1559865600

https://backpack.tf/profiles/76561198416395887#!/compare/1559347200/1559520000

SALE 9

bulk for strange professional ks australium scattergun

https://backpack.tf/profiles/76561198416395887#!/compare/1559865600/1559952000

https://backpack.tf/profiles/76561198879041986#!/compare/1559692800/1559952000

SALE 10

sold to quickbuyer

https://backpack.tf/profiles/76561198271956608#!/compare/1560384000/1560470400

SALE 11

bulk or unknown

https://backpack.tf/profiles/76561198092382473#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198016663834#!/compare/1562112000/1562284800

classifieds at the time of making this suggestion.

https://gyazo.com/67277eee8b45c708745ba9a692a44247

sales at 9, 9, 9, 10, 10, and 13. 13 is high due to multiple sales at lower, as well as 2 sellers at lower. taking a range of 9-10 keys here.