Sale #1:

https://backpack.tf/profiles/76561198195205727#!/compare/1547164800/1547337600

Untraceable.

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Sale #2:

https://backpack.tf/profiles/76561198164806677#!/compare/1550188800/1552435200

Untraceable.

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Sale #3:

https://backpack.tf/profiles/76561198397039970#!/compare/1552867200/1552953600

Untraceable.

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Sale #4:

https://backpack.tf/profiles/76561198215492261#!/compare/1550448000/1552262400

Sold for 5 keys.

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Sale #5:

https://backpack.tf/profiles/76561198814345631#!/compare/1547769600/1547856000

Untraceable.

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Marketplace.tf stats:

https://marketplace.tf/items/1117;5;u3019

Past 90 days:

1x $9.90 ($9.90 / $1.80 = ~5.5 keys)

1x $9.00 ($9.00 / $1.75 = ~5 keys)

Sales:

5, 5, 5.5. Going with 5 - 5.5 keys.