Sale #1:

https://backpack.tf/profiles/76561198040255714#!/compare/1552003200/1552089600

https://backpack.tf/profiles/76561198401509004#!/compare/1551657600/1552089600

Sold for 34 keys.

34 keys

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Sale #2:

https://backpack.tf/profiles/76561198289040457#!/compare/1550102400/1550188800

Sold for a Gifted Circling Heart Old Guadalajara (25 keys)

25 keys

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Sale #3:

https://backpack.tf/profiles/76561198202135278#!/compare/1546992000/1547942400

Sold for a Bubbling Pencil Pusher (18 keys) and 27 keys.

45 keys

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Sale #4:

https://backpack.tf/profiles/76561198061275415#!/compare/1548374400/1548460800

Unsure.

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Sale #5:

https://backpack.tf/profiles/76561198061275415#!/compare/1548892800/1548979200

Sold for 12 keys and a Cool Festivized Killstreak Pizza Polished Scattergun (Minimal Wear).

Using for the Pizza Scattergun suggestion.

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Sale #6:

https://backpack.tf/profiles/76561198132182386#!/compare/1549497600/1550016000

Sold for 43 keys.

43 keys

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Sale #7:

https://backpack.tf/profiles/76561198059098316#!/compare/1553126400/1553212800

Sold for 55 keys.

55 keys

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Sale #8:

https://backpack.tf/profiles/76561198279165042#!/compare/1550016000/1550102400

Sold for an Isotope Festivized Killstreak Tiger Buffed Rocket Launcher (Field-Tested) (18 keys) and 15 keys.

33 keys

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Sale #9:

https://backpack.tf/profiles/76561198279165042#!/compare/1550016000/1550102400

Sold for 34 keys.

34 keys

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Sale #10:

https://backpack.tf/profiles/76561198401509004#!/compare/1550534400/1551484800

Sold for 42 keys.

42 keys

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Sale #11:

https://backpack.tf/profiles/76561198028188341#!/compare/1547251200/1547596800

Sold for a Cool Festivized Professional Killstreak Merc Stained Grenade Launcher (Factory New) (36 keys) and 16 keys.

52 keys

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Sale #12:

https://backpack.tf/profiles/76561198205629231#!/compare/1547251200/1547337600

Untracable.

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Sale #13:

https://backpack.tf/profiles/76561198032448583#!/compare/1547856000/1547942400

Untracable.

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Sale #14:

https://marketplace.tf/items/590;5;u61

Sold for $42.51.

$42.51 / $1.75 = ~24 keys

24 keys

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Sale #15:

https://marketplace.tf/items/590;5;u61

Sold for $79.02.

$79.02 / $1.80 = ~44 keys

44 keys

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Sale #16:

https://marketplace.tf/items/590;5;u61

Sold for $79.02.

$79.02 / $1.81 = ~44 keys

44 keys

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Sale #17:

https://marketplace.tf/items/590;5;u61

Sold for $45.12.

$45.12 / $1.80 = ~25 keys

25 keys

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Sale #18:

https://marketplace.tf/items/590;5;u61

Sold for $89.99.

$89.99 / $1.79 = ~50 keys

50 keys

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Minis:

Gifted Circling Heart Old Guadalajara:

https://backpack.tf/profiles/76561198289040457#!/compare/1550361600/1550448000

Sold for 25 keys.

25 keys

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Isotope Festivized Killstreak Tiger Buffed Rocket Launcher (Field-Tested):

https://backpack.tf/profiles/76561198279165042#!/compare/1549756800/1549843200

Sold with 8 keys for a Circling Peace Sign Front Runner (26 keys).

18 keys

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Circling Peace Sign Front Runner:

https://backpack.tf/profiles/76561197970932773#!/compare/1548028800/1548547200

Sold with a Green Confetti Medic's Mountain Cap (13.5 keys) and a Vivid Plasma Polar Bear (12 keys).

26 keys

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Cool Festivized Professional Killstreak Merc Stained Grenade Launcher (Factory New):

https://backpack.tf/profiles/76561198105543135#!/compare/1549324800/1549411200

Sold for 36 keys

36 keys

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Bubbling Pencil Pusher:

https://backpack.tf/profiles/76561198096856475#!/compare/1547856000/1547942400

Sold for 18 keys.

18 keys

Sales:

24, 25, 25, 33, 34, 34, 42, 43, 44, 44, 45, 50, 52, 55. 34 keys are quickbuys, not using. 42 - 50 keys as requested by polar, seems like a fair range.