History 1: https://backpack.tf/item/8564660860

Sold for a Strange Professional Killstreak Australium Sniper Rifle:

https://backpack.tf/profiles/76561198363320256#!/compare/1612915200/1613433600

https://backpack.tf/profiles/76561199102396250#!/compare/1613347200/1613433600

Rifle is ~56-57 keys (mean of 56.5 ~57) https://gladiator.tf/sales?item=Strange%20Professional%20Killstreak%20Australium%20Sniper%20Rifle&at=2021-05-04T08:16:01.262Z

No buyout, but there were some lower sellers when this sale happened https://gladiator.tf/listings/6029c7098073545bf65fa57d

Untraceable/Bulk:

https://backpack.tf/profiles/76561199102396250#!/compare/1615593600/1615680000

https://backpack.tf/profiles/76561198139171368#!/compare/1615593600/1615680000

Bulk:

https://backpack.tf/profiles/76561198139171368#!/compare/1615593600/1615680000

https://backpack.tf/profiles/76561199143627226#!/compare/1615593600/1615680000

Sold for 46 keys:

https://backpack.tf/profiles/76561199143627226#!/compare/1616025600/1616112000

https://backpack.tf/profiles/76561198085102003#!/compare/1616112000/1616198400

Bulk for the Collector's Professional Killstreak Original:

https://backpack.tf/profiles/76561198085102003#!/compare/1617580800/1617753600

https://backpack.tf/profiles/76561198005070905#!/compare/1617753600/1617840000

1:1 for a Scorching Flames Crack Pot:

https://backpack.tf/profiles/76561198005070905#!/compare/1617840000/1618012800

https://backpack.tf/profiles/76561198076122878#!/compare/1616457600/1619049600

Could use there

History 2: https://backpack.tf/item/7679456954

Added 7 keys for a Circling Heart Killer's Kabuto:

https://backpack.tf/profiles/76561198083712388#!/compare/1612396800/1612915200

https://backpack.tf/profiles/76561198061489334#!/compare/1612828800/1612915200

Kabuto is in-date at 45-50 keys (mean of 47.5) https://backpack.tf/suggestion/6082eb5c4d312e025203ac62

47.5-7=40.5 ~41 keys, no buyout

Sold for 42 keys:

https://backpack.tf/profiles/76561198061489334#!/compare/1617753600/1617840000

https://backpack.tf/profiles/76561198322096229#!/compare/1617840000/1618358400

History 3: https://backpack.tf/item/7415852471

Untraceable/Bulk:

https://backpack.tf/profiles/76561198069985545#!/compare/1612396800/1612828800

https://backpack.tf/profiles/76561199042982570#!/compare/1612828800/1617840000

Dumped to Quicksell.Store:

https://backpack.tf/profiles/76561199042982570#!/compare/1612742400/1612828800

https://backpack.tf/profiles/76561198850121720#!/compare/1612656000/1612742400

33 keys match in buyer's compare:

https://backpack.tf/profiles/76561198850121720#!/compare/1612828800/1612915200

https://backpack.tf/profiles/76561198291070684#!/compare/1612828800/1612915200

Buyout was 44, more must have been involved

Added 4 keys for a Strange Secialized Killstreak Australium Rocket Launcher:

https://backpack.tf/profiles/76561198291070684#!/compare/1613347200/1613433600

https://backpack.tf/profiles/76561198115179017#!/compare/1613347200/1613433600

45 flat for the RL https://gladiator.tf/sales?item=Strange%20Specialized%20Killstreak%20Australium%20Rocket%20Launcher&at=2021-05-04T08:17:53.549Z https://gladiator.tf/listings/609049d8c58a69d895d2145e

54-4=41 keys. Buyout was 48, doesn't cap https://gladiator.tf/listings/60291cf315f70643451bf2b5

History 4: https://backpack.tf/item/7405001704

Sold for 39 keys:

https://backpack.tf/profiles/76561198847267051#!/compare/1613347200/1613952000

https://backpack.tf/profiles/76561198157452762#!/compare/1613433600/1613520000

Sold to a bot:

https://backpack.tf/profiles/76561198157452762#!/compare/1614556800/1614643200

https://backpack.tf/profiles/76561198337734785#!/compare/1614643200/1614729600

Untraceable, nothing matches:

https://backpack.tf/profiles/76561198337734785#!/compare/1617753600/1617840000

https://backpack.tf/profiles/76561198132389375#!/compare/1617667200/1617840000

Sales at 39, 41, 41, 42, (44?), 46, 57

57 is definitely an outlier here, not to mention there are 2 for sale at 50 rn and there were lower sellers when that sale happened https://gladiator.tf/listings/60291cf315f70643451bf2b5

39 was to a quickbuyer, excluding it would balance out the range too

Let's go with 41-46