Sale #1:

https://marketplace.tf/items/721;5;u31

Sold for $15.99.

$15.99 / $1.81 = ~9 keys

9 keys

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Sale #2:

https://marketplace.tf/items/721;5;u31

Sold for $15.95.

$15.95 / $1.80 = ~9 keys

9 keys

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Sale #3:

https://marketplace.tf/items/721;5;u31

Sold for $11.03.

$11.03 / $1.66 = ~6.5 keys

6.5 keys

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Sale #4:

https://backpack.tf/profiles/76561198122096342#!/compare/1547769600/1547856000

Sold for 9 keys

9 keys

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Sale #5:

https://backpack.tf/profiles/76561198352738720#!/compare/1548374400/1548460800

Untracable.

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Sale #6:

https://backpack.tf/profiles/76561198352738720#!/compare/1546992000/1547251200

https://backpack.tf/profiles/76561198370790285#!/compare/1547164800/1547251200

Untracable.

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Sale #7:

https://backpack.tf/profiles/76561198370790285#!/compare/1546732800/1546819200

Sold for about 9 keys worth of items, not completely sure.

9 keys

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Sale #8:

https://backpack.tf/profiles/76561198214188676#!/compare/1545696000/1545782400

Sold for 8.5 keys.

8.5 keys (Quickbuy)

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Sale #9:

https://backpack.tf/profiles/76561198085363794#!/compare/1545696000/1545782400

Sold with 19.5 keys for a Disco Beat Down Ground Control (32 keys).

12.5 keys (Outlier)

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Sale #10:

https://backpack.tf/profiles/76561198018101085#!/compare/1544918400/1545004800

Bulk.