Sale #1:

https://backpack.tf/profiles/76561198041186431#!/compare/1547942400/1548028800

Untracable.

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Sale #2:

https://backpack.tf/profiles/76561198075763406#!/compare/1548288000/1548460800

SCM Sale.

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Sale #3:

https://backpack.tf/profiles/76561198120382814#!/compare/1544745600/1545004800

Sold for a Stormy Storm Hottie's Hoodie (14 keys), 1 key, and 56 refined (~1.3 keys).

16 keys

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Sale #4:

https://backpack.tf/profiles/76561198050509345#!/compare/1549324800/1549411200

Untracable.

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Sale #5:

https://backpack.tf/profiles/76561197998898020#!/compare/1543017600/1543190400

Sold for 13 keys and 20 ref.

13 keys

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Sale #6:

https://backpack.tf/profiles/76561198123441069#!/compare/1549152000/1549238400

Sold for 15 keys

15 keys

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Sale #7:

https://marketplace.tf/items/48;5;u34

Sold on February 3, 2019 for $31.94.

$31.94 / $1.80 = ~17.7 keys

18 keys

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Minis:

Stormy Storm Hottie's Hoodie:

https://backpack.tf/profiles/76561198024867201#!/compare/1543104000/1543190400

Sold for 16 keys. Current seller at 14 keys (https://i.imgur.com/mFnvY6C.png), going with this.

14 keys