Resuggestion from https://backpack.tf/suggestion/5f078f7fc7e1c51eef1b4442

Copy pasting the proof as is because none of it is mine:

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Proof by https://backpack.tf/u/76561198028392502

https://backpack.tf/profiles/76561198163065314#!/compare/1586649600/1587427200 - Sold for 5 Keys + 22 Refined (0.4 Keys at the time)

https://backpack.tf/profiles/76561198851605504#!/compare/1586995200/1587340800 - Those Keys/Ref were used to buy the Brain-Warming

https://backpack.tf/profiles/76561198400492976#!/compare/1590796800/1590883200 - Sold for 6 Keys + 14.11 Refined (0.26 Keys at the time)

https://scrap.tf/auctions/VXEK0Z - Sold for 7 Keys

https://imgur.com/a/zEsdzAP - New Seller at 7.5 Keys

https://backpack.tf/item/1436990270

Thanks for the help everyone for teaching me about suggestions including Shuffle Spy who I stole his prove from

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6.5-7 keys