Sale 1:

https://backpack.tf/profiles/76561197964171516#!/compare/1589414400/1589500800

https://backpack.tf/profiles/76561198178847331#!/compare/1589500800/1589587200

Sold for ~23 keys

sale 2:

https://backpack.tf/profiles/76561199005154104#!/compare/1591833600/1591920000

https://backpack.tf/profiles/76561198337734785#!/compare/1591833600/1591920000

QS

sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1593475200/1593561600

https://backpack.tf/profiles/76561198106158616#!/compare/1593129600/1593820800

Sold for keys, can trace 6.

Sale 4:

https://backpack.tf/profiles/76561198819400644#!/compare/1591574400/1592352000

https://backpack.tf/profiles/76561198097846099#!/compare/1591401600/1591747200

Sold with Aces Counter + ST Skullcracker for CH Goggles

use there, few sales on the Goggles

sale 5:

https://backpack.tf/profiles/76561198259064231#!/compare/1590624000/1591056000

https://backpack.tf/profiles/76561198360479576#!/compare/1590796800/1590883200

Sold for 10 keys?

sale 6:

https://backpack.tf/profiles/76561198360479576#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198034085028#!/compare/1590883200/1590969600

Sold with ~12 keys in Aussies for CH Outta + ~2 keys in sweets

use there

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

B/O of 24 keys

sale 7:

https://backpack.tf/profiles/76561198034085028#!/compare/1590969600/1591401600

https://backpack.tf/profiles/76561198186201090#!/compare/1591228800/1591315200

Bulky for items

sale 8:

https://backpack.tf/profiles/76561198186201090#!/compare/1591228800/1591315200

https://backpack.tf/profiles/76561198095080813#!/compare/1591056000/1591315200

Sold for ~19 keys in sweets (note that max head was sold for keys on same day, but Id match does not show those keys matching)

sale 9:

https://marketplace.tf/items/tf2/30549;5;u56

$39.99 / $2.00 = 20.00 keys

$39.99 / $2.00 = 20.00 keys

$35.56 / $1.99 = 17.87 keys

$44.99 / $1.92 = 23.43 keys

Total sales @:

18, 19, 20, 20, 23, 23 keys

Taking 18 - 23 keys.