Sale #1:

https://backpack.tf/profiles/76561198006136307#!/compare/1552003200/1552089600

Sold for 38 keys.

38 keys

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Sale #2:

https://backpack.tf/profiles/76561198077173426#!/compare/1552348800/1552521600

Sold for 32 keys.

32 keys

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Sale #3:

https://backpack.tf/profiles/76561198002757046#!/compare/1553472000/1553558400

Bulk.

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Sale #4:

https://backpack.tf/profiles/76561198307230510#!/compare/1548288000/1548374400

Sold for an Orbiting Fire Swagman's Swatter (15 keys), a Brain Drain Vampire Vanquisher (11 keys), and 4 keys.

No minis available for the Swatter, going with seller at 15 keys (https://i.imgur.com/X7vh1lh.png).

30 keys

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Sale #5:

https://backpack.tf/profiles/76561198307230510#!/compare/1549324800/1549411200

Untracable.

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Sale #6:

https://backpack.tf/profiles/76561198158206236#!/compare/1550448000/1550534400

Sold for a Green Confetti Brim-Full Of Bullets (18.5 keys) and a Circling TF Logo Mann of Reason (15 keys)

No minis available for the Brim-Full Of Bullets, going with the current price.

34 keys

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Sale #7:

https://bot.tf/stats/item?def=338&q=5&ef=Green+Energy&craft=1&aus=0&ks=0

https://backpack.tf/profiles/76561198448829129#!/compare/1547938800/1548025200

Sold for 31 keys and 33 ref.

32 keys

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Sale #8:

https://bot.tf/stats/item?def=338&q=5&ef=Green+Energy&craft=1&aus=0&ks=0

https://backpack.tf/profiles/76561198448829129#!/compare/1550530800/1550617200

Sold for 40 keys.

40 keys

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Minis:

Circling TF Logo Mann of Reason:

https://backpack.tf/profiles/76561198058223674#!/compare/1552348800/1552608000

Sold for 15 keys.

15 keys

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Brain Drain Vampire Vanquisher:

https://backpack.tf/profiles/76561198376856802#!/compare/1550016000/1550188800

Sold for 11 keys.

11 keys

Sales:

30, 32, 32, 34, 38, 40. 32 is too common not to include, but the 30 keys sale has no mini for the Swatter and seems too low, not using. Going with 32 - 40 keys.