Sale 1:

https://backpack.tf/profiles/76561198002757046#!/compare/1542240000/1542326400

https://backpack.tf/profiles/76561198005121419#!/compare/1542240000/1542326400

20 keys?

Sale 2:

https://backpack.tf/profiles/76561198313538268#!/compare/1541289600/1541376000

https://backpack.tf/profiles/76561198118545253#!/compare/1541376000/1541462400

Lantern Hallmark?

Sale 3:

https://backpack.tf/profiles/76561198118545253#!/compare/1541376000/1541462400

https://backpack.tf/profiles/76561198182213262#!/compare/1541376000/1541462400

Untrace

Sale 4:

https://backpack.tf/profiles/76561198182213262#!/compare/1544918400/1545004800

https://backpack.tf/profiles/76561198067411283#!/compare/1545004800/1545091200

Bulk

Sale 5:

https://backpack.tf/profiles/76561198160856661#!/compare/1540080000/1540166400

https://backpack.tf/profiles/76561198123790040#!/compare/1539734400/1540252800

Untrace

Sale 6:

https://backpack.tf/profiles/76561198296439158#!/compare/1541289600/1541548800

https://backpack.tf/profiles/76561198043936328#!/compare/1541116800/1541289600

Untrace

Sale 7:

https://backpack.tf/profiles/76561198044672680#!/compare/1542758400/1543449600

https://backpack.tf/profiles/76561197994697258#!/compare/1543363200/1543449600

Bulk

Sale 8:

https://backpack.tf/profiles/76561197994697258#!/compare/1545350400/1545436800

https://backpack.tf/profiles/76561198048486255#!/compare/1545436800/1545868800

Sold for Sulph Fr-0 + ~1 key in sweets

Fr-0 Mini:

https://backpack.tf/suggestion/5c3d3e4244325a2b893d495d

Suggestion for 24.5 keys

Total is 25.5 keys

Sale 9, 10, 11:

https://marketplace.tf/items/146;5;u16

Sold for 54.99, 31.01, 45 USD

Keys at 1.78, 1.76, 1.73 USD

Total is 30.89, 17.62, 26.01 keys

Total sales @:

17.62, 20, 25.5, 26.01, 30.89 keys

Buyers up to 20 keys,

Taking 26 - 31 keys.