Sale 1:

https://backpack.tf/profiles/76561198090541539#!/compare/1594512000/1597190400

https://backpack.tf/profiles/76561198195933333#!/compare/1597536000/1597881600

Untrace.

Sale 2:

https://backpack.tf/profiles/76561198195933333#!/compare/1597881600/1597968000

https://backpack.tf/profiles/76561198123713690#!/compare/1597708800/1599868800

Untrace.

Marketplace.tf: https://marketplace.tf/items/tf2/31025;5;u30

Sale 3:

Aug 18 - $66.67 / $1.79 = 37.25 keys

No B/O

= 37 Keys.

Sale 4:

Sep 1- $55 / $1.83 = 30.05 keys

No B/O

= 30 Keys.

Sale 5:

Sep 11 - $60 / $1.85 = 32.43 keys

No B/O

= 32 Keys.

Sale 6:

Oct 13 - $59.99 / $1.89 = 31.74 keys

No B/O

= 32 Keys.

Xergoyf B>QS: https://backpack.tf/suggestion/5f8f0abce536a5179b2cd63c

https://backpack.tf/profiles/76561198195933333#!/compare/1597881600/1597968000

https://bot.tf/stats/listings/MGLN5VZQ

Likely a sale at 26

https://backpack.tf/profiles/76561198267189538#!/compare/1600473600/1600560000

Sold for 23 keys 20 ref to a buy order

https://backpack.tf/profiles/76561198879945899#!/compare/1601769600/1601856000

https://bot.tf/stats/listings/Y305ONJE

Likely sold for 27.5

https://bot.tf/stats/listings/YDPLR2G5

https://backpack.tf/profiles/76561198850274253#!/compare/1602115200/1602201600

Likely sale at 26

https://imgur.com/a/TBBR6f1 - Confirmed by Erik

37 is high, 26 - 32 should work here.