4 sales

1) With Circling Heart Physician's Protector (56) for 94 keys

https://backpack.tf/profiles/76561198271924256#!/compare/1552262400/1552348800

https://backpack.tf/profiles/76561198135388328#!/compare/1552262400/1552780800

Protector sold for $99.9 on March 11th, keys were $1.8

https://marketplace.tf/items/30625;5;u19

99.9/1.8 ≈ 56 keys

94 - 56 = 38

Guess this is not a bulk, so can be used there.

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2) Scam?

https://backpack.tf/profiles/76561198340575605#!/compare/NaN/1551312000

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3) 29 keys

https://backpack.tf/profiles/76561198135388328#!/compare/1551312000/1551398400

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4) ?

https://backpack.tf/profiles/76561198053720151#!/compare/1552262400/1552348800

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No marketplace sales.

https://marketplace.tf/items/30128;5;u8

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Total: 29, 38

If you will find other sales, you're welcome to report them.