I bought.

Sale:

https://backpack.tf/profiles/76561198114764948#!/compare/1729036800/1729123200

https://backpack.tf/profiles/76561198054642670#!/compare/1729036800/1729123200

450 keys

Screenshot of my purchase: https://imgur.com/a/stellar-ascent-tundra-top-pop-GQVtg9w

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Only 2 other sales happened somewhat recently, both are past the 3 month standard limit and the most recent of the two sold for 342 which is only 12 keys above the current buy orders and can be considered a quicksell. You can check it here: https://backpack.tf/profiles/76561198129310093#!/compare/1718755200/1719446400

Sale after that seems to be 420 though its a little messy to check and its 2 days away from being 4 months old: https://backpack.tf/profiles/76561198859721638#!/compare/1718668800/1718755200

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I'll stick with 450 here primarily due to the age of the other sales. The other 9 have not moved in 10+ months.