2 sales

1) SCM, but around buyorder's price (March 6th)

https://backpack.tf/profiles/76561198204869719?time=1551830400

https://steamcommunity.com/market/listings/440/Unusual%20Belgian%20Detective

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2) $50 on February 3rd, keys were $1.8

https://marketplace.tf/items/30128;5;u16

50/1.8 ≈ 28 keys

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Total: 28

If you will find other sales, you're welcome to report them.

Been a month already + no new sales.