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I purchased one on the Steam community market for $93.44 USD on June 26, 2018. (Seller received $81.26)
https://steamcommunity.com/market/listings/440/Unusual%20Your%20Worst%20Nightmare
https://imgur.com/a/X4Sd4Nm (Proof of purchase on market history)
Keys were ~$2.3 on 26 June
So, $93.44/2.3 = ~40 keys (as the supportive proof)