Sale #1:

https://backpack.tf/profiles/76561198277115869#!/compare/1552780800/1552953600

Untraceable.

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Sale #2:

https://backpack.tf/profiles/76561198292302282#!/compare/1551657600/1552348800

SCM Sale.

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Sale #3:

https://backpack.tf/profiles/76561198162282453#!/compare/1548633600/1548720000

Sold for 7 keys and 8 ref.

7 keys

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Sale #4:

https://backpack.tf/profiles/76561198173519105#!/compare/1553644800/1553817600

Sold for 6 keys and 35 ref.

7 keys

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Sale #5:

https://backpack.tf/profiles/76561198365857261#!/compare/1553385600/1553817600

Sold with 1 key and 11 ref for a Smoking Samur-Eye (11 keys).

10 keys

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Sale #6:

https://backpack.tf/profiles/76561198084126218#!/compare/1553040000/1553126400

Sold for 8 keys.

8 keys

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Sale #7:

https://marketplace.tf/items/30763;5;u3019

Sold for $22.22.

$22.22 / $1.80 = ~12 keys

12 keys

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Minis:

Smoking Samur-Eye:

https://backpack.tf/profiles/76561198365857261#!/compare/1553299200/1553385600

Sold for an Orbiting Planets Antarctic Eyewear (11 keys) [https://backpack.tf/profiles/76561197978814335#!/compare/1554595200/1554681600]

11 keys

Sales:

7, 7, 8, 10, 12. Buyers start at ~7.25, going with 8 - 12 keys.