Sale #1:

https://backpack.tf/profiles/76561198823736236#!/compare/1549756800/1549929600

Sold for 30 keys.

30 keys

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Sale #2:

https://backpack.tf/profiles/76561198386366689#!/compare/1550188800/1550275200

https://backpack.tf/profiles/76561198021055079#!/compare/1550188800/1550275200

Sold with a Taunt: Rancho Relaxo (.5 keys) and a Professional Killstreak Quickiebomb Launcher (1.7 keys) for a Stormy Storm Front Runner (18 keys).

16 keys

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Sale #3:

https://backpack.tf/profiles/76561198021055079#!/compare/1551139200/1551225600

Sold for 30 keys.

30 keys

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Sale #4:

https://backpack.tf/profiles/76561197964171516#!/compare/1548115200/1548201600

Sold for 22 keys and 40 ref.

23 keys

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Sale #5:

https://backpack.tf/profiles/76561198386366689#!/compare/1549584000/1549756800

SCM Sale.

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Minis:

Stormy Storm Front Runner:

https://backpack.tf/profiles/76561198114286047#!/compare/1552003200/1552176000

Sold for 18 keys.

18 keys

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Professional Killstreak Quickiebomb Launcher:

https://marketplace.tf/items/1150;6;kt-3

Sold for $3.00.

$3.00 / $1.8 = ~1.7 keys

1.7 keys

Sales:

16, 23, 30, 30. Going with 23 - 30 keys.