Sale #1:

https://backpack.tf/profiles/76561198006544512#!/compare/1549497600/1549584000

Sold for a Circling TF Logo Head Hedge (12 keys).

12 keys

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Sale #2:

https://backpack.tf/profiles/76561198164036774#!/compare/1547856000/1547942400

Sold for 11 keys and 4 ref.

11 keys

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Sale #3:

https://marketplace.tf/items/178;5;u6

Sold for $29.99.

$29.99 / $1.78 = ~16.8

17 keys

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Sale #4:

https://backpack.tf/profiles/76561198042689943#!/compare/1550620800/1550707200

Sold for an Orbiting Fire Barnstormer (13 keys) and 1 key.

14 keys

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Sale #5:

https://backpack.tf/profiles/76561198042689943#!/compare/1550707200/1550793600

Untracable.

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Minis:

Orbiting Fire Barnstormer:

https://backpack.tf/profiles/76561198372127799#!/compare/1550707200/1550793600

Sold for 13 keys and 22 ref.

13 keys

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TF Logo Head Hedge:

https://marketplace.tf/items/30978;5;u11

Sold for $21.99.

$21.99 / $1.70 = ~12.9 keys

Seller at 12 keys (https://i.imgur.com/3IE580C.png), using this.

12 keys

14 keys is too high due to the seller at 13 keys for 9 days (https://i.imgur.com/c6VNCuJ.png).