Sale 1:

https://backpack.tf/profiles/76561198346222059#!/compare/1585180800/1585267200

https://backpack.tf/profiles/76561198275012706#!/compare/1585180800/1585267200

Sold for 17 keys

sale 2:

https://backpack.tf/profiles/76561198275012706#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198972294135#!/compare/1585267200/1585353600

Sold for C9 Tyrant

https://bot.tf/stats/listings/46660O9L

B/O of 24 keys

sale 3:

https://backpack.tf/profiles/76561198972294135#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198150597524#!/compare/1585180800/1585353600

Bulk

sale 4:

https://backpack.tf/profiles/76561198150597524#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198382115458#!/compare/1585612800/1585699200

Bulk

sale 5:

https://backpack.tf/profiles/76561198382115458#!/compare/1585785600/1585872000

https://backpack.tf/profiles/76561198302399911#!/compare/1585872000/1585958400

sold for 17 keys

Sale 6:

https://backpack.tf/profiles/76561198302399911#!/compare/1586822400/1586908800

https://backpack.tf/profiles/76561198055999273#!/compare/1586908800/1586995200

Sold for ~18 keys

sale 7:

https://backpack.tf/profiles/76561198055999273#!/compare/1586908800/1586995200

https://backpack.tf/profiles/76561198879412409#!/compare/1586908800/1586995200

Can trace 12 keys, probably more.

Sale 8:

https://backpack.tf/profiles/76561198879412409#!/compare/1587254400/1587340800

https://backpack.tf/profiles/76561198859721638#!/compare/1587254400/1587340800

Bulk

sale 9:

https://backpack.tf/profiles/76561198859721638#!/compare/1587340800/1587427200

https://backpack.tf/profiles/76561198850274253#!/compare/1587340800/1587427200

QS

Sale 10:

https://backpack.tf/profiles/76561198850274253#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198045950906#!/compare/1587427200/1587686400

Sold for 17 keys

Sale 11:

https://backpack.tf/profiles/76561198850274253#!/compare/1581811200/1581897600

https://backpack.tf/profiles/76561198418981415#!/compare/1581984000/1581811200

https://backpack.tf/profiles/76561198850274253#!/compare/1581897600/1581984000

tradeback

sale 12:

https://backpack.tf/profiles/76561198850274253#!/compare/1582761600/1582848000

https://backpack.tf/profiles/76561198000598129#!/compare/1582761600/1582848000

Sold for keys

Sale 13:

https://backpack.tf/profiles/76561198211980493#!/compare/1583366400/1586044800

https://backpack.tf/profiles/76561198139487983#!/compare/1586476800/1586908800

https://backpack.tf/profiles/76561198976233202#!/compare/1586908800/1586995200

https://backpack.tf/profiles/76561198337734785#!/compare/1586908800/1586995200

untrace / Bulk / QS

sale 14:

https://backpack.tf/profiles/76561198337734785#!/compare/1587254400/1587340800

https://backpack.tf/profiles/76561198210673328#!/compare/1587254400/1587513600

Sold for at least 12 keys

Sale 15:

https://backpack.tf/profiles/76561198077934343#!/compare/1585180800/1587772800

https://backpack.tf/profiles/76561198985910282#!/compare/1587600000/1587686400

QS

sale 16:

https://backpack.tf/profiles/76561198985910282#!/compare/1589241600/1589328000

https://backpack.tf/profiles/76561198067719183#!/compare/1589241600/1589328000

https://backpack.tf/profiles/76561198963077319#!/compare/1588377600/1589414400

https://backpack.tf/profiles/76561198118157202#!/compare/1589328000/1589414400

Untrace / bulk

sale 17:

https://marketplace.tf/items/tf2/219;5;u62

$39.99 / $1.75 = 22.85 keys

$39.99 / $1.76 = 22.72 keys

$39.99 / $1.69 = 23.66 keys <--- https://backpack.tf/item/3340796751

$39.99 / $1.77 = 22.59 keys

$39.99 / $1.75 = 22.85 keys

$28 / $1.88 = 14.89 keys

$39.99 / $1.90 = 21.05 keys

Total sales @:

15, 17, 17, 17, 18, 21, 21, 23, 23, 23, 23, 24 keys

buyers up to 16 keys,

seller on MPTF for ~21 keys,

taking 17 - 24 keys, conserving around that unsold.