Taking last 2 months (July 26 on)

Sale 1:

https://backpack.tf/profiles/76561198038596784#!/compare/1564272000/1564790400

https://backpack.tf/profiles/76561198209726011#!/compare/1568073600/1568073600

Untrace

Sale 2:

https://backpack.tf/profiles/76561198112194208#!/compare/1564963200/1565568000

https://backpack.tf/profiles/76561198340634356#!/compare/1565308800/1565395200

Sold for ~3.10 keys

Sale 3:

https://backpack.tf/profiles/76561198340634356#!/compare/1564876800/1564963200

https://backpack.tf/profiles/76561198117839865#!/compare/1460764800/1565222400

Keys

sale 4:

https://backpack.tf/profiles/76561198157315119#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198160856661#!/compare/1566604800/1566691200

Bulk

sale 5:

https://backpack.tf/profiles/76561198160856661#!/compare/1568678400/1568764800

https://backpack.tf/profiles/76561198119574760#!/compare/1568678400/1568764800

Sold for ~3.25 keys

Sale 6:

https://backpack.tf/profiles/76561198119574760#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198110956101#!/compare/1568851200/1568937600

Sold for ~2.5 keys

Sale 7:

https://backpack.tf/profiles/76561198110956101#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198373741086#!/compare/1569110400/1569196800

Sold for ~3.5 keys

Sale 8:

https://backpack.tf/profiles/76561198036144976#!/compare/1565395200/1565481600

https://backpack.tf/profiles/76561198840357141#!/compare/1565395200/1565481600

Not unusual

sale 9:

https://backpack.tf/profiles/76561198158581816#!/compare/1564444800/1564531200

https://backpack.tf/profiles/76561198334598690#!/compare/1564444800/1564531200

QS

Sale 10:

https://backpack.tf/profiles/76561198044442415#!/compare/1564531200/1565654400

https://backpack.tf/profiles/76561198186922501#!/compare/1565222400/1565395200

Bulk

Sale 11:

https://backpack.tf/profiles/76561198186922501#!/compare/1566950400/1567036800

https://backpack.tf/profiles/76561198087169198#!/compare/1567036800/1567123200

Sold for 4 keys

sale 12:

https://backpack.tf/profiles/76561198444839741#!/compare/1566691200/1567036800

https://backpack.tf/profiles/76561198066345235#!/compare/1566777600/1567036800

Sold for ~3.1 keys

Sale 13:

https://backpack.tf/profiles/76561198154268023#!/compare/1567987200/1568246400

https://backpack.tf/profiles/76561198101092551#!/compare/1567728000/1567987200

Bulk

sale 14:

https://backpack.tf/profiles/76561198152145557#!/compare/1559347200/1564963200

https://backpack.tf/profiles/76561198145360192#!/compare/1551830400/1566172800

SCM

sale 15:

https://backpack.tf/profiles/76561198030777085#!/compare/1569110400/1569283200

https://backpack.tf/profiles/76561198305676157#!/compare/1569024000/1569110400

Sold for 3 keys

sale 16:

https://backpack.tf/profiles/76561198800614484#!/compare/1568505600/1568592000

https://backpack.tf/profiles/76561198242301690#!/compare/1568505600/1568592000

SCM

Sale 17:

https://backpack.tf/profiles/76561198242301690#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198156255538#!/compare/1569024000/1569110400

Bulk

sale 18:

https://backpack.tf/profiles/76561198346897149#!/compare/1565049600/1565136000

https://backpack.tf/profiles/76561198134902030#!/compare/1565136000/1565222400

https://backpack.tf/profiles/76561198156255538#!/compare/1565049600/1565136000

untrace / QS

Sale 19:

https://backpack.tf/profiles/76561198394877897#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198246427928#!/compare/1568851200/1568937600

Sold for ~3.55 keys

sale 20 - 24:

https://marketplace.tf/items/tf2/30572;5;u3004

$9.49 / $1.80 = 5.27 keys

$7.11 / $1.84 = 3.86 keys

$8.25 / $1.82 = 4.53 keys

$7 / $1.81 = 3.87 keys <-- https://backpack.tf/item/3630850457

$7 / $1.81 = 3.87 keys <-- https://backpack.tf/item/3844213266

Bot.tf:

https://bot.tf/stats/item?def=30572&q=5&ef=%2772&craft=1&aus=0&ks=0&source=browser_script

2 sales @ 3 keys,

5 sales @ 3.1 keys,

1 sale @ 2.95 keys,

5 sales @ 4 keys,

1 sale @ 5 keys,

2 sales @ 3.55 keys

Total sales @:

2.5

2.95

3 (x3)

3.1 (x6)

3.25

3.5

3.55 (x3)

3.85 (x3)

4 (x5)

4.55

5

5.25

Buyers up to 2.70 keys,

seller for 3.39 keys newish listing, dropped from 5 keys,

seller for 3.5 keys seems to be listing and delisting...

seller for 3.68 keys dropping in price, previously unsold for ~3.9 keys, and before that for 4 keys....

unsold for 3.90 keys for about a month:

https://bot.tf/stats/listings/4PP1OGZ0

https://bot.tf/stats/listings/46NX0Z70

lets take the wide range of 3 - 4 keys, encompasses most sales.