Sale #1:

https://marketplace.tf/items/30863;5;u7

Sold for $20 (x2).

$20 / $1.80 = ~11 keys

11 keys

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Sale #2:

https://backpack.tf/profiles/76561198136383762#!/compare/1548374400/1548460800

Sold for a Cloud 9 Broadband Bonnet (10 keys)

10 keys

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Sale #3:

https://backpack.tf/profiles/76561198261300011#!/compare/1548374400/1548460800

Untracable.

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Sale #4:

https://backpack.tf/profiles/76561198018101085#!/compare/1548374400/1548460800

Untracable.

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Sale #5:

https://backpack.tf/profiles/76561198018101085#!/compare/1544918400/1545004800

Bulk.

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Sale #6:

https://backpack.tf/profiles/76561198093707809#!/compare/1545523200/1545609600

Sold with 2 keys for a Stormy Storm Lord Cockswain's Pith Helmet (10 keys)

8 keys

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Sale #7:

https://backpack.tf/profiles/76561198139421056#!/compare/1545523200/1546041600

Sold for 8 keys.

8 keys

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Sale #8:

https://backpack.tf/profiles/76561198072533607#!/compare/1546128000/1546214400

Sold with 1 key for a Bubbling Blast Defense (10 keys)

9 keys

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Sale #9:

https://backpack.tf/profiles/76561198197105903#!/compare/1549497600/1549584000

Untracable.

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Sale #10:

https://backpack.tf/profiles/76561198802184359#!/compare/1550361600/1550448000

Untracable.

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Sale #11:

https://backpack.tf/profiles/76561198196579110#!/compare/1550275200/1550534400

Sold for 8 keys 19 ref.

8.5 keys

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Sale #12:

https://backpack.tf/profiles/76561198443489337#!/compare/1550707200/1550793600

Untracable.

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Sale #13:

https://backpack.tf/profiles/76561198443489337#!/compare/1550793600/1550880000

Untracable.

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Sale #14:

https://backpack.tf/profiles/76561198341171690#!/compare/1552258800/1552345200

https://bot.tf/stats/item?def=30863&q=5&ef=Purple+Confetti&craft=1&aus=0&ks=0

Sold for 10 keys.

10 keys

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Sale #15:

https://backpack.tf/profiles/76561198208582767#!/compare/1552262400/1552348800

Bulk?