Sale #1:

https://backpack.tf/profiles/76561198301909422#!/compare/1544918400/1545004800

Sold for 14 keys and 1 ref

14 keys

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Sale #2:

https://i.imgur.com/CeyOSZu.png

https://marketplace.tf/items/318;5;u62

Sold for $42.86

$42.86 / $1.77 = 24.2

~24 keys

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Sale #3:

https://marketplace.tf/items/318;5;u62

Sold for $27.78 on February 24, 2019.

$27.78 / $1.80 = 15.43

15 keys