Mini #2.

Sale #1:

https://backpack.tf/profiles/76561198369089120#!/compare/1550275200/1550448000

Untracable.

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Sale #2:

https://backpack.tf/profiles/76561198255971078#!/compare/1545091200/1545782400

Bulk.

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Sale #3:

https://backpack.tf/profiles/76561198174432643#!/compare/1549670400/1552176000

Sold for a Stormy Storm Connoisseur's Cap (13.5 keys)

14 keys

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Minis:

Stormy Storm Connoisseur's Cap:

https://marketplace.tf/items/394;5;u29

Sales on February 5, 2019 and February 24, 2019 for $28.99 and $20, respectively.

$28.99 / $1.82 = ~16 keys

$20 / $1.80 = ~11 keys

11 - 16 keys, going with 13.5 keys.

13.5 keys