Hats are good

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Sale #1 - Sold For A HG Sky High Fly Guy + 2 Keys

https://backpack.tf/profiles/76561198052793694#!/compare/1528156800/1528243200

https://backpack.tf/profiles/76561198171023150#!/compare/1528070400/1528243200

Taking - 13.77 + 2 = 15.77 rounded to 16 keys

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Sky Fly Mini

https://marketplace.tf/items/30984;5;u8

Sold For $27

27 / 1.96 = 13.77

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Sale #2 - Sold With 2 Keys worth Of Adds For Pro Ks Ausi Wrench

https://backpack.tf/profiles/76561198171023150#!/compare/1528243200/1528502400

https://backpack.tf/profiles/76561198082407725#!/compare/1528329600/1528502400

Taking 25.7 - 2 = 23.7 rounded to 24 keys

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Wrench Mini

https://imgur.com/a/NRgbkc2

25.7 keys

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Sale #3 - Sold With 1 Key For An Aces Phantom

https://backpack.tf/profiles/76561198082407725#!/compare/1528329600/1528502400

https://backpack.tf/profiles/76561197964171516#!/compare/1528416000/1528502400

Taking - 23 - 1 = 22 keys

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Phantom Mini

https://backpack.tf/profiles/76561198830125323#!/compare/1525730400/1525816800

23 keys, id's match

https://backpack.tf/item/2636306908

https://backpack.tf/item/6645755541

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Overall Taking 22 - 24 keys

Excluding 16 keys, seems low