Resuggesting! Thank you to Blaze for giving me new info about the new sales!

Item 1

https://backpack.tf/item/398267590

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198166942230#!/compare/1695945600/1696464000

Buyer: https://backpack.tf/profiles/76561197990545681#!/compare/1697587200/1698105600

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561197990545681#!/compare/1697587200/1698105600

Buyer: https://backpack.tf/profiles/76561198070664972#!/compare/1694563200/1698105600

Item 2

https://backpack.tf/item/281017806

Sale #3

Bulk sale or transfer?-

Seller: https://backpack.tf/profiles/76561198156622144#!/compare/1692921600/1694563200

Buyer: https://backpack.tf/profiles/76561198859721638#!/compare/1694476800/1694563200

Sale #4

Sold for two Sunbeams Cold Killers (170 keys each) + 195 keys = 170+170+195 = 535ish keys-

Seller: https://backpack.tf/profiles/76561198859721638#!/compare/1694649600/1694736000

Buyer: https://backpack.tf/profiles/76561198140559064#!/compare/1694649600/1694736000

Marketplace.tf Sales

https://marketplace.tf/items/tf2/315;5;u8

MP.TF Sale #1

Sold for $1099 on August 23, 2023

Average Key Price @ $2ish

1099/2 = 549.5ish keys

Unknown History

MP.TF Sale #2

Sold for $1099 on September 8, 2023

Average Key Price @ $2.03ish

1099/2.03 = 541.37ish keys

https://backpack.tf/item/13465144811

Sales @ 535, 541, 550

Rounding this and taking 540-550