Help about physical edition please

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Dear Support,
I purchased a physical edition of this game because I like it and I wanted to own it in my physical library.

The seller assured me that this copy can be activated on Steam. Unfortunately I could't find a CD key inside. How can I activate it?

I can attach the receipt of my purchase if needed.

Thanks!

[Anubis]

Hi, send an e-mail to info@numantiangames.com with Steam User ID and proof of purchase. Thanks!

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Hello,
I already sent you an e-mail with the proof of purchase in 11 October 2015 but I didn't receive an answer. I will resend the same e-mail with my username.

Thank you.