Sale #1:

https://backpack.tf/profiles/76561197971079412#!/compare/1545004800/1546041600

Untracable.

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Sale #2:

https://backpack.tf/profiles/76561198133780954#!/compare/1551571200/1551744000

Untracable.

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Sale #3:

https://backpack.tf/profiles/76561198133780954#!/compare/1551484800/1551571200

Untracable.

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Sale #4:

https://backpack.tf/profiles/76561198133780954#!/compare/1551484800/1551571200

Untracable.

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Sale #5:

https://marketplace.tf/items/253;5;u30

Sold for $15.

$15 / $1.76 = ~8.5 keys

8.5 keys

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Sale #6:

https://marketplace.tf/items/253;5;u30

Sold for $17.78.

$17.78 / $1.81 = ~9.8 keys

10 keys

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Sale #7:

https://backpack.tf/profiles/76561198003935476#!/compare/1550275200/1550361600

Sold for 12 keys.

12 keys

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Sale #8:

https://backpack.tf/profiles/76561198150825689#!/compare/1549497600/1550102400

Sold for a Collector's Professional Killstreak Homewrecker (14 keys).

14 keys

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Sale #9:

https://backpack.tf/profiles/76561198293868873#!/compare/1547337600/1547683200

Untracable.

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Minis:

Collector's Professional Killstreak Homewrecker:

https://marketplace.tf/items/153;14;kt-3/

Sold for $25.

$25 / $1.79 = ~14 keys

14 keys

Not using the sale at $15 as there is a buyer higher than $15.