History 1: https://backpack.tf/item/4262956991

Untrace/bulk (couldn't find it in buyer's compares):

https://backpack.tf/profiles/76561198168119744#!/compare/1600214400/1601251200

https://backpack.tf/profiles/76561198091502579#!/compare/1601164800/1601251200

Then deposited to Marketplace.tf listed at $34.99

History 2: https://backpack.tf/item/4146439013

Untraceable sale:

https://backpack.tf/profiles/76561199001400167#!/compare/1598745600/1603324800

https://backpack.tf/profiles/76561197971691194#!/compare/1598832000/1598918400

History 3: https://backpack.tf/item/3479437253

Untraceable sale:

https://backpack.tf/profiles/76561198084284339#!/compare/1597363200/1598918400

https://backpack.tf/profiles/76561198014383676#!/compare/1598745600/1598918400

Bulk:

https://backpack.tf/profiles/76561198014383676#!/compare/1600992000/1601078400

https://backpack.tf/profiles/76561198325595749#!/compare/1600992000/1601078400

Deposited to Marketplace.tf at $34

Marketplace.tf sales untraceable via histories: https://marketplace.tf/items/tf2/1111;5;u3035

July 24 2020: $37.92/1.94=19.55 keys ~20

No buyout/20 keys?: https://bot.tf/stats/listings/M19VZ8N0

September 6 2020: $30/1.83=16.39 keys ~16

no buyout: https://bot.tf/stats/listings/MNREDRR8

September 28 2020: $32/1.85=17.30 keys ~17

No buyout: https://bot.tf/stats/listings/Y5OEJ0NE

Unsolds:

$34/1.85=18.37 keys

$34.99/1.85=18.91 keys

25 keys

Excluding 20 keys because it's higher than sellers and it's also the oldest sale in the past 3 months

Going 16-17