Resuggestion, thanks to Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561197980761347#!/compare/1580083200/1580169600

https://backpack.tf/profiles/76561198048851745#!/compare/1579996800/1580083200

Bulk

sale 2:

https://backpack.tf/profiles/76561198048851745#!/compare/1581724800/1581811200

https://backpack.tf/profiles/76561198294426922#!/compare/1581724800/1581811200

Sold for ~6.5 keys

sale 3:

https://backpack.tf/profiles/76561198294426922#!/compare/1581897600/1581984000

https://backpack.tf/profiles/76561198407183057#!/compare/1583280000/1584144000

untrace

sale 4:

https://backpack.tf/profiles/76561198061671352#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198144820745#!/compare/1585267200/1585353600

Sold for CPS Airdog

Airdog Mini:

https://backpack.tf/suggestion/5ea4c65d6e0f45601e4351e6

Suggestion for 8.75 keys

Sale 5:

https://backpack.tf/profiles/76561198144820745#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198952881478#!/compare/1585612800/1585872000

Untrace

Sale 6:

https://backpack.tf/profiles/76561198952881478#!/compare/1587427200/1587686400

https://backpack.tf/profiles/76561198106323995#!/compare/1587427200/1587513600

Untrace

sale 7:

https://backpack.tf/profiles/76561198106323995#!/compare/1587513600/1587686400

https://backpack.tf/profiles/76561198841279602#!/compare/1587427200/1587513600

QS

Sale 8:

https://marketplace.tf/items/tf2/151;5;u36

$14.44 / $1.70 = 8.49 keys

Total sales @:

6.5, 8.5, 9 keys

buyers up to ~6.5 keys,

new sellers at ~8 keys,

https://i.imgur.com/2R5C3C1.jpg

https://i.imgur.com/6ZVGAjW.jpg

watching sellers for now,

https://backpack.tf/item/1532546226

https://backpack.tf/item/1563117505

Mindacos' Part:

Given the seller at ~7.5, and the fact that other effects are selling at ~6.5(thus, making the "any effect 6.5 buyers redundant), i'd include 6.5 here for a range of 6.5-9.