Sale #1:

https://backpack.tf/profiles/76561198056571743#!/compare/1548374400/1548460800

Sold with 2 keys and 8 ref for a Potassium Bonnett (12.1 keys)

10 keys

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Sale #2:

https://backpack.tf/profiles/76561198203129156#!/compare/1547683200/1548460800

Untracable.

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Sale #3:

https://backpack.tf/profiles/76561198162098076#!/compare/1550707200/1550793600

Sold for a Steaming Mighty Mitre (10 keys)

10 keys

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Sale #4:

https://backpack.tf/profiles/76561198282858365#!/compare/1545436800/1545523200

Sold for 9 keys

9 keys

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Sale #5:

https://backpack.tf/profiles/76561198282858365#!/compare/1545523200/1545609600

Bulk?

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Sale #6:

https://backpack.tf/profiles/76561198085363794#!/compare/1545436800/1545609600

Sold for 9 keys and a taunt.

9 keys

Quickbuyers start at 9 keys, using 10 key sales.