Sale #1:

Sold for 35 keys:

https://imgur.com/a/hOpJT (Credits to ScreamyPants for providing the screenshot)

Sale #2:

Sold for a Green Black Hole Tartan Spartan:

https://backpack.tf/profiles/76561198077746093#!/compare/1505433600/1505520000

Cap:

https://backpack.tf/item/1562048764

Tartan:

https://backpack.tf/item/3657966247

Total: 41 keys

Sale #3:

Sold for a Scorching Flames Elf Esteem:

https://backpack.tf/profiles/76561198220858440#!/compare/1506211200/1506297600

Total: 35 keys as there is an ongoing suggestion for the Elf Esteem:

https://backpack.tf/suggestion/59c32ad5cf6c7577bd3deb99

Sale #4:

Sold for a Frostbite Big Elfin Deal and 2 keys:

https://backpack.tf/profiles/76561198149258718#!/compare/1505952000/1506038400

I couldn't find a suitable mini for the Elfin Deal