Sale 1:

https://backpack.tf/profiles/76561198170438985#!/compare/1590883200/1594684800

https://backpack.tf/profiles/76561198044934255#!/compare/1590969600/1591056000

Untrace

sale 2:

https://backpack.tf/profiles/76561198077927764#!/compare/1591660800/1591747200

https://backpack.tf/profiles/76561198086626711#!/compare/1590624000/1591747200

Can trace 4 keys

sale 3:

https://backpack.tf/profiles/76561198086626711#!/compare/1592524800/1594684800

https://backpack.tf/profiles/76561198334598690#!/compare/1592438400/1592524800

QS

sale 4:

https://backpack.tf/profiles/76561198197292179#!/compare/1589500800/1589587200

https://backpack.tf/profiles/76561198085880346#!/compare/1589500800/1589587200

Sold for ~5.5 keys (thanks Shuffle for the info!)

https://i.imgur.com/nkXrf9J.png

https://i.imgur.com/M0LJjRi.png

sale 5:

https://backpack.tf/profiles/76561198085880346#!/compare/1589673600/1589760000

https://backpack.tf/profiles/76561198277373335#!/compare/1589760000/1589846400

Sold for 6 keys (thanks Shuffle for the info!)

https://i.imgur.com/j3HBmFY.png

https://i.imgur.com/eBVZc7R.png

https://bot.tf/stats/listings/Y79G7EEL

B/O of 10 keys

sale 6:

https://backpack.tf/profiles/76561198277373335#!/compare/1590796800/1590969600

https://backpack.tf/profiles/76561198203142530#!/compare/1590710400/1590796800

Sold for ~10 keys (6 used to buy Box Trot)

sale 7:

https://backpack.tf/profiles/76561198283413510#!/compare/1589328000/1590710400

https://backpack.tf/profiles/76561198369565670#!/compare/1590624000/1590710400

Sold for DP HWAH

HWAH Mini:

https://backpack.tf/suggestion/5f29fc51e42e91662925788c

Suggestion for 6.75 keys

sale 8:

https://backpack.tf/profiles/76561198369565670#!/compare/1590710400/1590883200

https://backpack.tf/profiles/76561198299363052#!/compare/1590710400/1590883200

Can trace some ref

sale 9:

https://backpack.tf/profiles/76561198299363052#!/compare/1590710400/1590883200

https://backpack.tf/profiles/76561198334598690#!/compare/1590883200/1590969600

Untrace / QS

sale 10:

https://backpack.tf/profiles/76561198334598690#!/compare/1591142400/1591228800

https://backpack.tf/profiles/76561198306910039#!/compare/1590537600/1591574400

Keys

sale 11:

https://backpack.tf/profiles/76561198306910039#!/compare/1591574400/1592179200

https://backpack.tf/profiles/76561198334598690#!/compare/1591488000/1591574400

QS

sale 12:

https://backpack.tf/profiles/76561198334598690#!/compare/1592784000/1592784000

https://backpack.tf/profiles/76561198023051867#!/compare/1592784000/1592697600

Transfer

sale 13:

https://marketplace.tf/items/tf2/30836;5;u132

$19 / $1.92 = 9.90 keys <--- https://backpack.tf/item/8164632563

$19 / $1.94 = 9.79 keys <--- https://backpack.tf/item/8182154582 | https://bot.tf/stats/listings/4R0K9VQK B/O of 13 keys

$15.2 / $1.94 = 7.84 keys

$19 / $1.96 = 9.69 keys <--- https://backpack.tf/item/8229806663

Total sales @:

5.5, 6, ~7, 8, 9.5, 10, 10, 10 keys

buyers up to ~5.5 keys, one buyer at 6 keys.

https://i.imgur.com/NwsjMgK.png

week old seller at 9 keys,

given that 6 took 2 days to resell from 5.5,

can't ignore all high sales,

let's try 7 - 10 keys....