Thanks Explocivo808 for the help!

If I checked marketplace...

Item history: https://backpack.tf/item/8007245680

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1st sale

Marketplace.tf

https://marketplace.tf/items/tf2/31049;5;u19;strange

Sold for 29.11$

The average price of a key in the past week was 1.68$: https://marketplace.tf/items/tf2/5021;6

29.11 / 1.68 = 17.32

Rounding to 17

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2nd sale

My purchase

26 keys pure

https://imgur.com/MVWqatX

Buyer: https://backpack.tf/profiles/76561198050651176

Seller: https://backpack.tf/profiles/76561198069588637

26

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The other hat has been sold on the mannco and moved between banned users. Ignoring

With the following sales taking range 17-26 keys