Only Recent Sale:

Item 1

https://backpack.tf/item/1197143835

Sale 1

https://imgur.com/a/pNlrbGR

https://backpack.tf/profiles/76561197966756586#!/compare/1727222400/1727308800

https://backpack.tf/profiles/76561197974943082#!/compare/1726963200/1727308800

1540 keys + Anti-Freeze Berliner's Bucket Helm + Strange Burly Beast + Hypno-Eyes + The Magical Mercenary + Medimedes

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Mini for the Anti-Freeze Berliner's Bucket Helm

Item 1

https://backpack.tf/item/1653034530

Skipping past mannco.store...

Sale 1

https://backpack.tf/profiles/76561198063127837#!/compare/1724371200/1724457600

https://backpack.tf/profiles/76561199523405376#!/compare/1724371200/1724457600

Untrace on buyer side, looks bulky anyways

Sale 2

https://backpack.tf/profiles/76561199523405376#!/compare/1725494400/1725580800

https://backpack.tf/profiles/76561198310750043#!/compare/1725494400/1725580800

Untrace on seller side, no clue

Sale 3

https://backpack.tf/profiles/76561198310750043#!/compare/1726272000/1726358400

https://backpack.tf/profiles/76561197974943082#!/compare/1726272000/1726358400

260 keys

(The first key in seller compare matches alongside the bulk of 259)

Taking 260 keys

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https://gladiator.tf/sales?item=Strange%20Burly%20Beast&at=2024-09-27T21:48:10.555Z

~120 - 128 for the Burly = 124 keys

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https://gladiator.tf/sales?item=Hypno-Eyes&at=2024-09-27T21:48:38.034Z

~25.5 keys

for the Hypno

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https://gladiator.tf/sales?item=Magical%20Mercenary&at=2024-09-27T21:48:57.111Z

~8 keys for the Magical Mercenary

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https://gladiator.tf/sales?item=Medimedes&at=2024-09-27T21:49:27.191Z

~16 keys for the Medimedes

1540 + 260 + 124 + 25.5 + 8 + 16 = ~1974 keys

Total Sales

1974

https://imgur.com/a/F5UXuih

Rounding to the nearest 50 - > 1950 keys

Thanks to Icycrevasse for edits!