Sale 1:

https://backpack.tf/profiles/76561198034155040#!/compare/1531699200/1531785600

https://backpack.tf/profiles/76561198349886701#!/compare/1531699200/1531785600

Sold for ~14 keys (QS)

Sale 2:

https://backpack.tf/profiles/76561198349886701#!/compare/1534636800/1534723200

https://backpack.tf/profiles/76561198107186192#!/compare/1528848000/1534723200

Sold for 16 keys

Sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1534118400/1534204800

https://backpack.tf/profiles/76561198062611321#!/compare/1534118400/1534204800

Keys Untrace

Sale 4:

https://backpack.tf/profiles/76561198062611321#!/compare/1534204800/1534291200

https://backpack.tf/profiles/76561198031126990#!/compare/1534204800/1534291200

Bulk.

Sale 5:

https://backpack.tf/profiles/76561198192602363#!/compare/1530662400/1530748800

https://backpack.tf/profiles/76561198170258839#!/compare/1530662400/1530748800

Sold for Planets Company Mann

Use there.

Sale 6:

https://backpack.tf/profiles/76561198170258839#!/compare/1530662400/1530748800

https://backpack.tf/profiles/76561198085116555#!/compare/1530662400/1530748800

Sold for Showstopper Trackman

Low, based on sellers.

Sale 7:

https://backpack.tf/profiles/76561198085116555#!/compare/1530662400/1530748800

https://backpack.tf/profiles/76561198089894338#!/compare/1530576000/1530748800

Sold for Stormy Trophy Belt(17)

Sale 8:

https://marketplace.tf/items/100;5;u58

Sold for 34.99 USD

Keys at 1.88 USD

Total is 18.61 keys

Total sales @:

14, 16, 17, 18.61

Buyers up to ~15 keys.

Sellers down to 17 keys.

Can't currently upload to imgur for some reason.

Taking 16 - 17 keys