5 sales

1) Bulk

https://backpack.tf/profiles/76561198061275415#!/compare/1551139200/1551225600

https://backpack.tf/profiles/76561198155324560#!/compare/1551139200/1551225600

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2) ?

https://backpack.tf/profiles/76561198120585187#!/compare/1551657600/1551744000

https://backpack.tf/profiles/76561198220074896#!/compare/1548979200/1550188800

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3) Bubbling Magistrate's Mullet (9)

https://backpack.tf/profiles/76561198183246594#!/compare/1549843200/1550361600

Mullet

https://backpack.tf/suggestion/5be32529cf6c753ffd75da31

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4) 11 keys + 25 ref

https://backpack.tf/profiles/76561198183246594#!/compare/1549670400/1549756800

https://backpack.tf/profiles/76561198048851745#!/compare/1549670400/1549756800

Taking 12.

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5) $23.40 on February 6th, keys were $1.81

https://marketplace.tf/items/30128;5;u34

23.4/1.81 ≈ 13 keys

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Total: 9, 12, 13

If you will find other sales, you're welcome to report them.

New sale: bulk

https://backpack.tf/profiles/76561198120585187#!/compare/1553817600/1553904000