And there are more sales here.

https://backpack.tf/item/4840321943

https://backpack.tf/item/5141838023

Untrace

https://backpack.tf/profiles/76561198114402400#!/compare/1597276800/1597363200

https://backpack.tf/profiles/76561198098807162#!/compare/1593993600/1599523200

Sold to qs store

https://backpack.tf/profiles/76561198098807162#!/compare/1593993600/1599523200

https://backpack.tf/profiles/76561198850178158#!/compare/1599436800/1599523200

Sold to qs store

https://backpack.tf/profiles/76561198037674114#!/compare/1599609600/1600300800

https://backpack.tf/profiles/76561199084784906#!/compare/1599782400/1601337600

Untrace

https://backpack.tf/profiles/76561198153877379#!/compare/1599350400/1600214400

https://backpack.tf/profiles/76561198037674114#!/compare/1597968000/1599609600

Untrace

https://backpack.tf/profiles/76561198268703524#!/compare/1599264000/1599350400

https://backpack.tf/profiles/76561198153877379#!/compare/1598918400/1599264000

Sold for Circling TF Logo Bone Dome

https://backpack.tf/profiles/76561198966838493#!/compare/1599177600/1599264000

https://backpack.tf/profiles/76561198268703524#!/compare/1599177600/1599264000

Untrace, maybe the 10 keys~

https://backpack.tf/profiles/76561198269337198#!/compare/1599264000/1599350400

https://backpack.tf/profiles/76561198966838493#!/compare/1599177600/1599264000

Untrace

https://backpack.tf/profiles/76561198073025812#!/compare/1597363200/1597622400

https://backpack.tf/profiles/76561198001673221#!/compare/1597363200/1597449600

Sold for TW Tyrant's Helm + sweets adding to around 1.41 keys~

https://backpack.tf/profiles/76561198396499936#!/compare/1597363200/1597449600

https://backpack.tf/profiles/76561198073025812#!/compare/1597363200/1597449600

Most of which are untraceable, but the Bone Dome and Tyrant's Helm both need updates so you can use their sales as well.

Also, the sale for 20 keys, 38 refined, rounds up to 21 keys.