Sale #1:

https://backpack.tf/profiles/76561198200475465#!/compare/1548115200/1548201600

Sold for a Collector's Professional Killstreak Gunslinger (18.7 keys), Strange Collector's Professional Killstreak Widowmaker (79.5 keys), a Stormy Storm Climbing Commander (21 keys), a Terror-Watt Executioner (22.5 keys), and a Strange Professional Killstreak Australium Ambassador (14.1 keys).

18.7 + 79.5 + 21 + 22.5 + 14.1 = ~156 keys

B/O was 100 (https://i.imgur.com/2U31QsT.jpg) credit to j58

100 keys

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Minis:

Collector's Professional Killstreak Gunslinger:

https://backpack.tf/profiles/76561198000933698#!/compare/1552953600/1553040000

https://steamcommunity.com/market/listings/440/Collector%27s%20Professional%20Killstreak%20Gunslinger

Sold for $43.43.

$43.43 / $2.32 = ~18.7 keys

18.7 keys

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Strange Collector's Professional Killstreak Widowmaker:

https://marketplace.tf/items/527;14;strange;kt-3

Sold for $140.

$140 / $1.76 = ~79.5 keys

79.5 keys

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Strange Professional Killstreak Australium Ambassador:

https://backpack.tf/stats/Strange/Australium%20Professional%20Killstreak%20Ambassador/Tradable/Craftable

~14.1 keys

Sales:

100. Going with 100 keys.