I Love Rising!

Sale 1: ~25 Keys Pure.

https://backpack.tf/profiles/76561197994697258#!/compare/1553558400/1553644800

https://backpack.tf/profiles/76561198101487802#!/compare/1553644800/1553990400

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Marketplace.tf Sales:

https://marketplace.tf/items/30974;5;u11

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Sale 2: QS.

May 15

$30.16 / $1.82 = 16.57 keys

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Sale 3: ~22 Keys.

May 20

$41.02 / $1.83 = 22.42 keys

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Usable Sales: 22/25

Going with 22-25 keys.

Thanks to scourge for the premium!