Sale #1:

https://backpack.tf/profiles/76561198021272428#!/compare/1548892800/1548979200

Untracable.

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Sale #2:

https://backpack.tf/profiles/76561198289882800#!/compare/1548460800/1548547200

Sold for 16 keys.

16 keys

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Sale #3:

https://backpack.tf/profiles/76561198412472303#!/compare/1547078400/1547164800

Sold with 3 keys for a Kill-a-Watt Pomade Prince (21 keys).

18 keys

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Sale #4:

https://backpack.tf/profiles/76561198021272428#!/compare/1545264000/1545350400

Unsure, search histories do not match.

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Sale #5:

https://backpack.tf/profiles/76561197995029705#!/compare/1544745600/1544832000

Sold for 18 keys.

18 keys

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Sale #6:

https://backpack.tf/profiles/76561198117543267#!/compare/1544313600/1544400000

Sold with 1 key for a Strange Ancient Codex Universal Translator (20.5 keys)

20 keys

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Sale #7:

https://backpack.tf/profiles/76561198153325445#!/compare/1546041600/1546128000

Unsure, search histories do not match.

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Sale #8:

https://backpack.tf/profiles/76561198037248506#!/compare/1551916800/1552003200

Sold for a Magnetic Hat Protector Universal Translator (16 keys) and ~4 keys of sweets.

20 keys

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Sale #9:

https://backpack.tf/profiles/76561198838447026#!/compare/1551913200/1551999600

https://bot.tf/stats/item?def=614&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

Sold for 16 keys.

16 keys

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Sale #9:

https://backpack.tf/profiles/76561198838447026#!/compare/1551826800/1551913200

https://bot.tf/stats/item?def=614&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

Sold for 16 keys.

16 keys

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Sale #10:

https://backpack.tf/profiles/76561198323565601#!/compare/1545868800/1545955200

https://bot.tf/stats/item?def=614&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

Sold for 15 keys.

15 keys

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Sale #11:

https://backpack.tf/profiles/76561198323565601#!/compare/1545865200/1545951600

https://bot.tf/stats/item?def=614&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

Sold for 13.5 keys

13.5 keys

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Sale #12:

https://backpack.tf/profiles/76561198838447026#!/compare/1551826800/1551913200

https://bot.tf/stats/item?def=614&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

Sold for 14 keys and 8.44 ref.

14 keys

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Sale #13:

https://backpack.tf/profiles/76561198838447026#!/compare/1551913200/1551999600

https://bot.tf/stats/item?def=614&q=5&ef=Blizzardy+Storm&craft=1&aus=0&ks=0

Sold for 14 keys and 8.44 ref.

14 keys

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Sale #14:

https://backpack.tf/profiles/76561198151284318#!/compare/1548288000/1549756800

SCM Sale.

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Sale #15:

https://backpack.tf/profiles/76561198817417602#!/compare/1546992000/1547251200

Sold for a Bubbling Caribou Companion (23 keys)

No available minis. Exclcuding, seems too high.

23 keys

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Sale #16:

https://marketplace.tf/items/614;5;u30

Sold for $21.65.

$21.65 / $1.79 = ~12 keys

12 keys

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Sale #17:

https://marketplace.tf/items/614;5;u30

Sold for $35.99.

$35.99 / $1.82 = ~20 keys

20 keys

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Sale #18:

https://marketplace.tf/items/614;5;u30

Sold for $38.80.

$38.80 / $1.75 = ~22 keys

22 keys

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Sale #19:

https://marketplace.tf/items/614;5;u30

Sold for $36.99.

$36.99 / $1.76 = ~21 keys

21 keys

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Sale #19:

https://marketplace.tf/items/614;5;u30

Sold for $36.98.

$36.98 / $1.79 = ~21 keys

21 keys

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Minis:

Kill-a-Watt Pomade Prince:

https://backpack.tf/profiles/76561198138536099#!/compare/1546646400/1546905600

Sold for 21 keys.

21 keys

Sales seem to fit best with 16 - 20.