Sale #1:

https://backpack.tf/profiles/76561197995380138#!/compare/1546732800/1546819200

https://backpack.tf/profiles/76561198302759439#!/compare/1546732800/1546819200

Sold for a Kill-a-Watt Team Captain (61 keys) and 11 keys.

72 keys

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Sale #2:

https://marketplace.tf/items/316;5;u30

Sold for $120.

$120 / $1.81 = ~66 keys

66 keys

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Minis:

Kill-a-Watt Team Captain:

https://backpack.tf/profiles/76561198264117106#!/compare/1550016000/1550102400

Sold with a key for a Disco Beat Down Master's Yellow Belt (62 keys).

61 keys