Sale 1: Bulk.

https://backpack.tf/profiles/76561198057566887#!/compare/1553040000/1553126400

https://backpack.tf/profiles/76561198105071091#!/compare/1552867200/1553040000

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Sale 2: ~27 Keys.

Sold With A Strange Festivized Professional Killstreak Iron Bomber (10) For Time Warp Big Elfin Deal (36.5). (36.5-10=26.5)

https://backpack.tf/profiles/76561198105071091#!/compare/1553212800/1553299200

https://backpack.tf/profiles/76561198092541990#!/compare/1552780800/1553299200

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Marketplace.tf Sales:

https://marketplace.tf/items/30662;5;u121

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Sale 3: ~28 Keys.

Mar 3

$50.00 / $1.79 = 27.93 keys

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Usable Sales: 27/28

Going with 27-28 keys.

Thanks to scourge for the premium!