Sale #1:

Bought one for 11 keys:

https://imgur.com/a/BB8DJIq

https://backpack.tf/item/1650667871

Sale #2:

Sold with a key for a Dead Presidents Brigade Helm:

https://backpack.tf/profiles/76561198121326369#!/compare/1520726400/1520812800

Total: 12 - 1 = 11 keys (Supporting sale because Brigade Helm is outdated, couldn't find a suitable mini suggestion for it)

Sale #3:

Sold for 11 keys:

https://backpack.tf/profiles/76561198312583107#!/compare/1519516800/1519603200

https://backpack.tf/profiles/76561198043733521#!/compare/1514505600/1521936000

Sale #4:

Sold for 10 keys:

https://backpack.tf/profiles/76561198333522800#!/compare/1522540800/1522800000

https://backpack.tf/profiles/76561198337734785#!/compare/1522713600/1522800000

Sale #5:

Sold to a buyer for 9 keys and 6.77 refined:

https://backpack.tf/profiles/76561198158579646#!/compare/1522022400/1522368000

https://backpack.tf/profiles/76561198337734785#!/compare/1522281600/1522368000

Sale #6:

Sold to a buyer for 9 keys and 6.77 refined:

https://backpack.tf/profiles/76561198115699456#!/compare/1522454400/1522540800

https://backpack.tf/profiles/76561198337734785#!/compare/1522454400/1522540800

Sale #7:

Sold for 10 keys:

https://backpack.tf/profiles/76561198332228352#!/compare/1520899200/1520985600