You should mention the contents of each sale as K1ng did:

C9 Capotain (13) + 10 keys + spelled The Essential Accessories (resold for 14 keys) = 37 keys

https://backpack.tf/profiles/76561198153011059#!/compare/1658361600/1658448000

https://backpack.tf/profiles/76561199244599385#!/compare/1658188800/1658361600

https://gladiator.tf/time-machine?item=Molten+Mallard+Harmburg&at=2022-07-20T23%3A36%3A00.000Z --- B/O was 45

Sold with 4 keys for Blizzardy Nuke (~38) = 38 - 4 = 34 keys

https://backpack.tf/profiles/76561198268152403#!/compare/1660089600/1660176000

https://backpack.tf/profiles/76561198133392504#!/compare/1660089600/1660176000

https://gladiator.tf/time-machine?item=Molten%20Mallard%20Harmburg&at=2022-08-11T01:54:13.000Z --- B/O was 48.5

There is ALOT more sales. Look, I priced it for you <3

THIS SUGGESTION WAS GENERATED AUTOMATICALLY BUT SUPERVISED/FILLED BY A HUMAN.

OK,Scanned page 1

Scanned page 2

Found 3 instances with non-empty history.

[Instance #0]: https://backpack.tf/item/11448751265

[Transaction number]: 0

https://backpack.tf/profiles/76561198843180964#!/compare/1658361600/1661385600

https://backpack.tf/profiles/76561198133392504#!/compare/1660262400/1660348800

[Added]:

Molten Mallard Harmburg - 23.028 keys - 1 items

[Removed]:

Mann Co. Supply Crate Key - 1.0 keys - 2 items

Strange Purple Energy Fried Batter - 0.0 keys - 1 items

[Sum added]: 23.028 keys

[Sum removed]: 2.0 keys

*SOLD FOR Strange Purple Energy Fried Batter + 2 KEYS*

[Transaction number]: 1

https://backpack.tf/profiles/76561198133392504#!/compare/1660089600/1660176000

https://backpack.tf/profiles/76561198268152403#!/compare/1660089600/1660176000

[Added]:

Mann Co. Supply Crate Key - 1.0 keys - 4 items

Molten Mallard Harmburg - 23.028 keys - 1 items

[Removed]:

[Sum added]: 27.028 keys

[Sum removed]: 0 keys

*SOLD FOR Blizzardy Storm Nuke - 6 KEYS*

[Transaction number]: 2

https://backpack.tf/profiles/76561198268152403#!/compare/1659830400/1659916800

https://backpack.tf/profiles/76561198096697494#!/compare/1659830400/1659916800

[Added]:

Mann Co. Supply Crate Key - 1.0 keys - 6 items

Molten Mallard Harmburg - 23.028 keys - 1 items

[Removed]:

[Sum added]: 29.028 keys

[Sum removed]: 0 keys

*INTERMEDIATE TRADER WAS SKIPPED - 2 SALES*

*SOLD FOR Green Energy Full Metal Drill Hat - 6 KEYS*

*SOLD AS PART OF BULK FOR The Ooze Pampered Pyro*

[Transaction number]: 3

https://backpack.tf/profiles/76561198096697494#!/compare/1658361600/1658448000

no proper comparison found

*UNTRACE*

[Transaction number]: 4

no proper comparison found

https://backpack.tf/profiles/76561199244599385#!/compare/1658361600/1658448000

*SOLD FOR Purple Energy Bloke's Bucket Hat (27)*

[Transaction number]: 5

https://backpack.tf/profiles/76561199244599385#!/compare/1658188800/1658361600

https://backpack.tf/profiles/76561198153011059#!/compare/1658361600/1658448000

[Added]:

Molten Mallard Harmburg - 23.028 keys - 1 items

[Removed]:

Cloud 9 Carouser's Capotain - 7.509 keys - 1 items

[Sum added]: 23.028 keys

[Sum removed]: 7.509 keys

*SOLD FOR Cloud 9 Carouser's Capotain(8) + 10 KEYS*

[Transaction number]: 6

https://backpack.tf/profiles/76561198153011059#!/compare/1657929600/1658016000

https://backpack.tf/profiles/76561198184377139#!/compare/1657152000/1658016000

[Added]:

Molten Mallard Harmburg - 23.028 keys - 1 items

[Removed]:

Mann Co. Supply Crate Key - 1 keys - 28 items

[Sum added]: 23.028 keys

[Sum removed]: 28 keys

*SOLD FOR 28 KEYS*

[Instance #1]: https://backpack.tf/item/9438185810

[Transaction number]: 0

no proper comparison found

https://backpack.tf/profiles/76561198061926111#!/compare/1661731200/1663891200

*SOLD FOR 38 KEYS*

[Instance #2]: https://backpack.tf/item/3268895540

[Transaction number]: 0

https://backpack.tf/profiles/76561198243410170#!/compare/1657411200/1657929600

https://backpack.tf/profiles/76561198850178158#!/compare/1657670400/1657756800

[Added]:

Molten Mallard Harmburg - 23.028 keys - 1 items

[Removed]:

[Sum added]: 23.028 keys

[Sum removed]: 0 keys

*UNTRACE*

*SOLD FOR 38 KEYS*

ALL BP SALES:

*SOLD FOR Strange Purple Energy Fried Batter + 2 KEYS*

*SOLD FOR Blizzardy Storm Nuke - 6 KEYS*

*INTERMEDIATE TRADER WAS SKIPPED - 2 SALES*

*SOLD FOR Green Energy Full Metal Drill Hat - 6 KEYS*

*SOLD AS PART OF BULK FOR The Ooze Pampered Pyro*

*UNTRACE*

*SOLD FOR Purple Energy Bloke's Bucket Hat (27)*

*SOLD FOR Cloud 9 Carouser's Capotain(8) + 10 KEYS*

*SOLD FOR 28 KEYS*

*SOLD FOR 38 KEYS*

*UNTRACE*

*SOLD FOR 38 KEYS*

- PE Bloke's will be 42: https://backpack.tf/suggestion/63399cf0a0d41df8010d9747

- Blizzardy Nuke was recently updated at 39.5, so the Harmburg sale will be ~36.

- Buy orders were way below the sales listed as "not usable" at the time of each sale. Buy orders are under 30 now as well.

So 36-43 should work here.