Sale #1:

https://backpack.tf/profiles/76561198092540896#!/compare/1549756800/1549843200

https://backpack.tf/profiles/76561198167790780#!/compare/1549756800/1549843200

Looks like it was bought off scrap.tf by the seller, then sold for 8.5 keys.

8.5 keys

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Sale #2:

https://backpack.tf/profiles/76561198085931736#!/compare/1550016000/1550102400

Untraceable.

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Sale #3:

https://backpack.tf/profiles/76561198267652983#!/compare/1550016000/1550102400

Unsure, possibly lower than 8 keys.