Sale 1:

https://marketplace.tf/items/30958;5;u18

$19 / $1.72 = 11.05 keys

Sale 2:

untrace

https://backpack.tf/profiles/76561198214502915#!/compare/1539043200/1541289600

https://backpack.tf/profiles/76561198121830870#!/compare/1541116800/1541203200

Sale 3:

transfer

https://backpack.tf/profiles/76561198045775820#!/compare/1546473600/1546560000

https://backpack.tf/profiles/76561198341171690#!/compare/1546473600/1546560000

Sale 4:

Bulk

https://backpack.tf/profiles/76561197964546925#!/compare/1545091200/1545177600

https://backpack.tf/profiles/76561198079050329#!/compare/1545091200/1545177600

Sale 5:

untrace

https://backpack.tf/profiles/76561198335791307#!/compare/1543017600/1543104000

https://backpack.tf/profiles/76561198444060701#!/compare/1543017600/1543449600

Sale 6:

10 pure

Key histories dont match but keys came from marketplace/trade bots so likely traded too keys away too fast.

https://backpack.tf/profiles/76561198444060701#!/compare/1545782400/1546041600

https://backpack.tf/profiles/76561198325571264#!/compare/1545955200/1546041600

Sale 7:

untrace

https://backpack.tf/profiles/76561198325571264#!/compare/1546128000/1546214400

https://backpack.tf/profiles/76561198342476957#!/compare/1546128000/1546214400

Sale 8:

Bandito would be above unsolds as theres Bandito buyers at 12 keys

polar cap unsold for 3 weeks at 12: https://imgur.com/a/0w4HCuO

Bandito buyers at 12: https://imgur.com/a/jH7priQ

Tesla Coil Wide-Brimmed Bandito

https://backpack.tf/profiles/76561198342476957#!/compare/1546214400/1546300800

https://backpack.tf/profiles/76561198353598847#!/compare/1546214400/1546300800

Sale 9:

7 pure - under buyers

https://backpack.tf/profiles/76561198353598847#!/compare/1546214400/1546300800

https://backpack.tf/profiles/76561198363395191#!/compare/1546214400/1546300800