https://marketplace.tf/items/tf2/379;5;u13

October 9 - $87 = 49 keys

October 17 - $88 = 48 keys

November 25 - $87.99 = 50 keys

https://backpack.tf/profiles/76561198126679929#!/compare/1573344000/1574035200

https://backpack.tf/profiles/76561198044125635#!/compare/1574035200/1574726400

This is the November 25 Marketplace sale.

https://backpack.tf/item/4653247477

This is the October 17 history link.

https://backpack.tf/item/919141036

This is most likely the October 1 history link.

All of the Marketplace sales are clean.

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https://backpack.tf/profiles/76561198067699902#!/compare/1574553600/1574726400

https://backpack.tf/profiles/76561198044125635#!/compare/1574726400/1574812800

Bulk

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https://backpack.tf/profiles/76561197960769824#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198014288444#!/compare/1559606400/1567987200

(Duped) Bulk

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https://backpack.tf/item/393603447

(Duped) Some scammer stuff :(

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https://backpack.tf/profiles/76561198337734785#!/compare/1568937600/1569024000

https://backpack.tf/profiles/76561198081907770#!/compare/1568937600/1569024000

(Duped) Untraceable

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https://backpack.tf/profiles/76561198081907770#!/compare/1569456000/1569542400

https://backpack.tf/profiles/76561198342161127#!/compare/1569456000/1569542400

(Duped) Likely quicksell for keys

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Current seller after the first bulk sale re-listed for 46 keys.

I go 46-50 keys