Item: https://backpack.tf/item/1672767779

https://backpack.tf/profiles/76561199141202231#!/compare/1713052800/1738972800

https://backpack.tf/profiles/76561198398997592#!/compare/1738886400/1739059200 - looks like it resold for 65 keys

https://backpack.tf/item/1672767779

https://backpack.tf/profiles/76561198118157202#!/compare/1732838400/1732924800

https://backpack.tf/profiles/76561198098125861#!/compare/1732579200/1732838400 - Untraceable/gambling

https://backpack.tf/profiles/76561198098125861#!/compare/1732838400/1732924800

https://backpack.tf/profiles/76561199151101524#!/compare/1732924800/1733011200 - Untraceable/gambling

https://backpack.tf/profiles/76561199151101524#!/compare/1732924800/1733011200

https://backpack.tf/profiles/76561198112556959#!/compare/1732924800/1733011200 - untraceable/gambling

https://backpack.tf/profiles/76561198112556959#!/compare/1733097600/1733184000

https://backpack.tf/profiles/76561199246789651#!/compare/1733184000/1733270400 - untraceable/gambling

https://backpack.tf/profiles/76561199246789651#!/compare/1733270400/1733788800 - untraceable/gambling

https://backpack.tf/profiles/76561199120201440#!/compare/1733443200/1733788800

https://backpack.tf/profiles/76561199120201440#!/compare/1733270400/1733443200 - untraceable

https://backpack.tf/profiles/76561199026390261#!/compare/1733356800/1733443200

https://backpack.tf/profiles/76561199026390261#!/compare/1736035200/1736121600

https://backpack.tf/profiles/76561199158211678#!/compare/1735948800/1736035200 - Sold for 55 + 24 Keys from janissary = 79 Keys

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https://backpack.tf/profiles/76561198930632283#!/compare/1735948800/1736035200 — Janissary was bought for 24 Keys

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https://backpack.tf/item/1698580596

https://backpack.tf/profiles/76561199634145883#!/compare/1734566400/1736899200 - untraceable

https://backpack.tf/profiles/76561198877320307#!/compare/1736812800/1736899200

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The key histories of the keys used in the "65 Keys trade" seems to check out with being given to buy from the original seller

A range of 79—100 should work