Sale 1:

Sold for 8 keys + negligible metal

https://backpack.tf/profiles/76561199581722058#!/compare/1732233600/1732320000

https://backpack.tf/profiles/76561198191137318#!/compare/1732233600/1732320000

https://backpack.tf/item/14996966487

= 8 keys

Sale 2:

Sold for 7 keys

https://backpack.tf/profiles/76561198199245323#!/compare/1729987200/1730592000

https://backpack.tf/profiles/76561197967159739#!/compare/1730160000/1730246400

https://backpack.tf/item/12373958457

= 7 keys

Other Sales:

#1

https://backpack.tf/profiles/76561198035464165#!/compare/1729987200/1730073600

https://backpack.tf/profiles/76561199564942025#!/compare/1729900800/1729987200

https://backpack.tf/item/15000879398

Bulk/untraceable

#2

https://backpack.tf/profiles/76561199564942025#!/compare/1730073600/1730160000

https://backpack.tf/profiles/76561198310972287#!/compare/1730073600/1730160000

https://backpack.tf/item/15000879398

Sold with Heavy Rain Buy a Life for 9 keys + around half a key in metal

Not using without knowing the B/O.

#3

https://backpack.tf/profiles/76561198055470220#!/compare/1728604800/1729036800

https://backpack.tf/profiles/76561198345675007#!/compare/1729555200/1729900800

https://backpack.tf/item/14996966487

Untraceable

#4

https://backpack.tf/profiles/76561198345675007#!/compare/1731974400/1732320000

https://backpack.tf/profiles/76561199581722058#!/compare/1732233600/1732320000

https://backpack.tf/item/14996966487

Untraceable

#5

https://backpack.tf/profiles/76561198191137318#!/compare/1732406400/1732492800

https://backpack.tf/profiles/76561198882192265#!/compare/1732060800/1732492800

https://backpack.tf/item/14996966487

Bulk for 50 keys

Marketplace Sales:

https://marketplace.tf/items/tf2/31156;5;u3183

$15, October 23rd

https://marketplace.tf/items/tf2/5021;6 - keys were $1.89

15/1.89 = 7.937, rounds to 8 keys

Sellers:

https://i.imgur.com/0GgzLpz.png

https://backpack.tf/item/12508665899 - 20 keys

Sales at:

7

8 (2x, 1 marketplace)

Buyer at 7, excluding 7.

Taking 8 flat.