Sale 1:

https://backpack.tf/profiles/76561198163450048#!/compare/1568678400/1568851200

https://backpack.tf/profiles/76561198334598690#!/compare/1568764800/1568851200

Sold for ~6 keys (QS)

Sale 2:

https://backpack.tf/profiles/76561198044934255#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198047869622#!/compare/1559260800/1570233600

Bulk

Sale 3:

https://backpack.tf/profiles/76561198286528455#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198278463603#!/compare/1566432000/1566518400

Untrace

sale 4:

https://backpack.tf/profiles/76561198278463603#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198106332769#!/compare/1567296000/1567382400

Sold for 7 keys

sale 5:

https://backpack.tf/profiles/76561198106332769#!/compare/1567555200/1567641600

https://backpack.tf/profiles/76561198371988173#!/compare/1567555200/1567641600

sold for 8 keys

sale 6:

https://backpack.tf/profiles/76561198371988173#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561198264853358#!/compare/1552089600/1567900800

Sold for keys

Sale 7:

https://backpack.tf/profiles/76561198264853358#!/compare/1552089600/1567900800

https://backpack.tf/profiles/76561198303067606#!/compare/1567814400/1567900800

Can trace a Duel...

Sale 8:

https://backpack.tf/profiles/76561198200133593#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198205523060#!/compare/1567555200/1567900800

Sold for 8 keys

sale 9:

https://backpack.tf/profiles/76561198205523060#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198048610662#!/compare/1567900800/1567987200

Bulk

Sale 10:

https://backpack.tf/profiles/76561198048610662#!/compare/1570924800/1571011200

https://backpack.tf/profiles/76561198313819127#!/compare/1571011200/1571097600

Sold with negligible sweets for Steaming Bombing + 3 keys

nothing solid on the Bombing (All sales higher than unsolds or at/lower than buyers)

Sale 11:

https://backpack.tf/profiles/76561198313819127#!/compare/1571443200/1571616000

https://backpack.tf/profiles/76561198323565601#!/compare/1571529600/1571616000

Sold for 7 keys (QS)

Sale 12:

https://marketplace.tf/items/tf2/219;5;u12

$15 / $1.82 = 8.24 keys

https://backpack.tf/item/494250086

Total sales @:

7, 8, 8, 8.24 keys

universal buyer at 7 keys,

gonna go with 8 flat.