9 sales

1) duped Green Energy Buckaroos Hat (28) + 2 keys

https://backpack.tf/profiles/76561198054275169#!/compare/1552521600/1552780800

https://backpack.tf/profiles/76561198119149660#!/compare/1552694400/1552780800

Buckaroos

https://backpack.tf/suggestion/5c29b721cf6c75226576e1fd

28 + 2 = 30

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2) 22 keys + some ref

https://backpack.tf/profiles/76561198317418604#!/compare/1552608000/1552694400

https://backpack.tf/profiles/76561198193170813#!/compare/1552521600/1552694400

22

Buy order.

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3) ?

https://backpack.tf/profiles/76561198193170813#!/compare/1546387200/1548633600

https://backpack.tf/profiles/76561198004622284#!/compare/1547337600/1548374400

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4) SCM?

https://backpack.tf/profiles/76561198195420449#!/compare/1550275200/1550361600

https://backpack.tf/profiles/76561198449307015#!/compare/1550361600/1550448000

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5) ?

https://backpack.tf/profiles/76561198335791307#!/compare/1550361600/1550448000

Probably a bot buy order again.

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6) ?

https://backpack.tf/profiles/76561198031927313#!/compare/1552694400/1552780800

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7) ?

https://backpack.tf/profiles/76561198335791307#!/compare/1550275200/1550361600

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https://marketplace.tf/items/30753;5;u61

8) $40 on January 23rd, keys were $1.75

40/1.75 ≈ 23 keys

9) $40 on March 16th, keys were $1.79

40/1.79 ≈ 22 keys

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Total: 22, 22, 23, 30

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

Since Squashington got rid of buck and keys in a day when trade was happened (1st sale), I'm posting screenshot of my sale here

https://imgur.com/mFpzUIJ

New sale: 30 keys

https://backpack.tf/profiles/76561198317418604#!/compare/1553558400/1553644800