Resuggestion (Credit to K1ng)

Sale 1:

https://backpack.tf/profiles/76561199111073161#!/compare/1632096000/1632182400

https://backpack.tf/profiles/76561198933058988#!/compare/1624147200/1636848000

~ 8.5 keys

Sale 2:

https://backpack.tf/profiles/76561198267702582#!/compare/1637452800/1638230400

https://backpack.tf/profiles/76561199193412191#!/compare/1638230400/1638316800

untrace

Sale 3:

https://backpack.tf/profiles/76561198798879879#!/compare/1631577600/1631664000

https://backpack.tf/profiles/76561198109650171#!/compare/1631577600/1631664000

~7.5 keys

Sale 4:

https://backpack.tf/profiles/76561198109650171#!/compare/1631664000/1631750400

https://backpack.tf/profiles/76561198236558066#!/compare/1631750400/1631836800

untrace

Sale 5:

https://backpack.tf/profiles/76561198202715615#!/compare/1630713600/1633132800

https://backpack.tf/profiles/76561198236558066#!/compare/1632441600/1632528000

untrace

Sale 6:

https://backpack.tf/profiles/76561198202715615#!/compare/1633132800/1633219200

https://backpack.tf/profiles/76561199102237820#!/compare/1633132800/1633219200

~ 7.5 keys

Sale 7:

https://backpack.tf/profiles/76561199102237820#!/compare/1634428800/1634515200

https://backpack.tf/profiles/76561198357004034#!/compare/1634256000/1634774400

untrace

Sale 8:

https://backpack.tf/profiles/76561198357004034#!/compare/1634774400/1635379200

https://backpack.tf/profiles/76561199132627345#!/compare/1634688000/1634860800

bulk

Sale 9:

https://backpack.tf/profiles/76561199132627345#!/compare/1635465600/1635552000

https://backpack.tf/profiles/76561198017901187#!/compare/1635292800/1635552000

bulk

Sale 10 - 11:

https://marketplace.tf/items/tf2/158;5;u60

Sold twice on Marketplace.tf for 15.33, and 16.99 on September 20th and November 12th

15.33/1.84 ~ 8.5 keys

16.99/1.89 ~ 9 keys

Unsold for a while at ~8.5

https://gladiator.tf/listings/61bee6bc86711134ab5e0f67

https://gladiator.tf/listings/61abb5c98b8adfed7b1a848b

Sales:

7.5, 7.5, 8.5, 8.5, 9

Taking 7.5 - 8.5 keys due to the seller at ~ 8.5 for quite awhile