Item 1

https://backpack.tf/item/9383674239

Sale 1

https://backpack.tf/profiles/76561198438176201#!/compare/1687996800/1688083200

https://backpack.tf/profiles/76561198856753348#!/compare/1687910400/1687996800

Silver Cyclone Taunt: The Mannbulance! + Kill-a-Watt Pugilist's Protector

Sale 2

https://backpack.tf/profiles/76561198856753348#!/compare/1688428800/1688515200

https://backpack.tf/profiles/76561198135388328#!/compare/1688428800/1688515200

11 keys

Gonna exclude both those sales as buyer bought and re-sold for less to a scrap dump

Item 2

https://backpack.tf/item/9374394925

Sale 3

https://gladiator.tf/time-machine?item=Gourdian%20Angel%20Fire%20Fighter&at=2023-08-18T11:50:19.000Z

https://backpack.tf/profiles/76561199084784906#!/compare/1692316800/1692403200

https://backpack.tf/profiles/76561198354459626#!/compare/1692316800/1692403200

Likely ~14 keys, but I can only match 13 keys on seller side

Sale 4

https://backpack.tf/profiles/76561198354459626#!/compare/1692403200/1692489600

https://backpack.tf/profiles/76561199185252456#!/compare/1693353600/1693526400

Probably a mp.tf sale

Item 3

https://backpack.tf/item/9289208159

Sale 5

https://gladiator.tf/time-machine?item=Gourdian%20Angel%20Fire%20Fighter&at=2023-08-31T13:38:23.000Z

https://backpack.tf/profiles/76561199110809353#!/compare/1693440000/1693526400

https://backpack.tf/profiles/76561198354459626#!/compare/1693353600/1693440000

Can't match keys

Mp.tf

https://marketplace.tf/items/tf2/31108;5;u162

$29.99 / $2.01 = ~15 keys (Aug 30)

Total Sales

13, 15

https://imgur.com/a/clnNlhC

13 was likely 14, but sale #5 was likely 13 keys as well so it should be fine to go with 13 - 15 keys c: