Sale 1:

https://backpack.tf/profiles/76561198063803737#!/compare/1565395200/1565481600

https://backpack.tf/profiles/76561198027196798#!/compare/1565395200/1565481600

Sold for ~7 keys

Sale 2:

https://backpack.tf/profiles/76561198167997186#!/compare/1561161600/1561680000

https://backpack.tf/profiles/76561198081187170#!/compare/1561507200/1561680000

Sold for ~8.5 keys

Sale 3:

https://backpack.tf/profiles/76561198081187170#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198855480250#!/compare/1561680000/1561766400

Untrace

Sale 4:

https://backpack.tf/profiles/76561198855480250#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198159656266#!/compare/1561680000/1561766400

Untrace

Sale 5:

https://backpack.tf/profiles/76561198159656266#!/compare/1562457600/1562544000

https://backpack.tf/profiles/76561198052035695#!/compare/1562457600/1562544000

Untrace

Sale 6:

https://backpack.tf/profiles/76561198052035695#!/compare/1566086400/1567296000

https://backpack.tf/profiles/76561198168863803#!/compare/1567209600/1567296000

Bp Buy

Sale 7:

https://backpack.tf/profiles/76561198003926663#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198012537041#!/compare/1562371200/1562457600

https://backpack.tf/profiles/76561198939755793#!/compare/1562371200/1562457600

Untrace

Sale 8:

https://backpack.tf/profiles/76561198270711812#!/compare/1562976000/1563062400

https://backpack.tf/profiles/76561198384349249#!/compare/1563062400/1563148800

Can trace 5 keys

Sale 9:

https://backpack.tf/profiles/76561198384349249#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198291041323#!/compare/1563321600/1563408000

Sold for ~8 keys

Sale 10:

https://backpack.tf/profiles/76561198291041323#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198310631632#!/compare/1563321600/1563408000

Can trace 5 keys

sale 11:

https://backpack.tf/profiles/76561198310631632#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198425413352#!/compare/1563235200/1563408000

Sold for CPS Cannonball(~10)

Sale 12:

https://backpack.tf/profiles/76561198425413352#!/compare/1563235200/1563408000

https://backpack.tf/profiles/76561197996095002#!/compare/1563321600/1563408000

Sold for Planets Bootleg

use there

Sale 13:

https://backpack.tf/profiles/76561197996095002#!/compare/1563494400/1563580800

https://backpack.tf/profiles/76561198854662187#!/compare/1563494400/1563580800

Sold with ~1 key in sweets for OF Black Watch

use there

Sale 14:

https://backpack.tf/profiles/76561198854662187#!/compare/1563580800/1563926400

https://backpack.tf/profiles/76561198136334765#!/compare/1563494400/1563667200

Bulky

sale 15:

https://backpack.tf/profiles/76561198136334765#!/compare/1563667200/1563753600

https://backpack.tf/profiles/76561198082311111#!/compare/1563667200/1563753600

Sold for ~9 keys

Sale 16:

https://backpack.tf/profiles/76561198082311111#!/compare/1565740800/1565913600

https://backpack.tf/profiles/76561198415368238#!/compare/1565654400/1566000000

Sold for Planets Bonk

use there

Sale 17:

https://backpack.tf/profiles/76561198415368238#!/compare/1566000000/1566345600

https://backpack.tf/profiles/76561198121830870#!/compare/1565913600/1566000000

Sold for Miami Elfin(12)

Sale 18:

https://backpack.tf/profiles/76561198202438499#!/compare/1562630400/1563321600

https://backpack.tf/profiles/76561198080179568#!/compare/1562976000/1563062400

QS

Sale 19:

https://marketplace.tf/items/tf2/30836;5;u56

$17.5 / $1.85 = 9.46 keys

$16.29 / $1.83 = 8.90 keys

$15.4 / $1.83 = 8.42 keys <-- https://backpack.tf/item/5390562090

$14.59 / $1.81 = 8.06 keys <-- https://backpack.tf/item/7427102885

Total sales @:

7, 8, 8.06, 8.42, 8.5, 8.90, 9.46, 10, 12 keys

Aging unsolds at 7, 8 keys,

gonna take 7 - 9 keys,

calling 9.5 + high.