Sale #1:

https://backpack.tf/profiles/76561198162675135#!/compare/1549929600/1552694400

Untracable.

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Sale #2:

https://backpack.tf/profiles/76561198305494036#!/compare/1547251200/1547337600

https://bot.tf/stats/item?def=1107&q=5&ef=Spectral+Swirl&craft=1&aus=0&ks=0

Bought for 16 keys, 30 ref.

17 keys

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Sale #3:

https://backpack.tf/profiles/76561198198896481#!/compare/1547510400/1547596800

Sold for a Cloud 9 Mighty Mitre (23.5 keys)

24 keys

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Sale #4:

https://backpack.tf/profiles/76561198198896481#!/compare/1547596800/1547683200

Sold for a Dead Presidents Tough Stuff Muffs.

Using for another suggestion.

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Sale #5:

https://backpack.tf/profiles/76561198108661486#!/compare/1548374400/1548460800

Sold for 18 keys.

18 keys

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Sale #6:

https://backpack.tf/profiles/76561198124440417#!/compare/1548547200/1548892800

Backpack sale?

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Sale #7:

https://backpack.tf/profiles/76561198335791307#!/compare/1550790000/1550876400

https://bot.tf/stats/item?def=1107&q=5&ef=Spectral+Swirl&craft=1&aus=0&ks=0

Bought for 16 keys, 30 ref.

17 keys

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Sale #8:

https://backpack.tf/profiles/76561198798888727#!/compare/1549929600/1550188800

Unsure.

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Sale #9:

https://marketplace.tf/items/1107;5;u3014

Sold for $32.09.

$32.09 / $1.80 = ~18 keys

18 keys

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Sale #10:

https://marketplace.tf/items/1107;5;u3014

Sold for $32.

$32 / $1.79 = ~18 keys

18 keys

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Sale #11:

https://marketplace.tf/items/1107;5;u3014

Sold for $30.92

$30.92 / $1.82 = ~17 keys

17 keys

Seller at 23 keys for 17 days makes 24 look like an outlier.