Sale #1:

https://backpack.tf/profiles/76561198025963071#!/compare/1547769600/1547856000

Sold with 5 keys for a Circling Peace Sign Samur-Eye (17.5 keys)

17.5 - 5 = 12.5

13 keys

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Sale #2:

https://backpack.tf/profiles/76561198316071886#!/compare/1549756800/1550102400

Bulk.

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Sale #3:

https://backpack.tf/profiles/76561198316071886#!/compare/1550102400/1550188800

Bulk.

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Sale #4:

https://marketplace.tf/items/30105;5;u36

Sold for $17.57.

$17.57 / $1.79 = ~9.8 keys

10 keys

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Sale #5:

https://marketplace.tf/items/30105;5;u36

Sold for $28.99.

$28.99 / $1.81 = ~16 keys

16 keys