Lost my game registration code.

Golden_Cat
Golden_Cat
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English is not my first language so sorry in advance for any error.
I bought the game from Steam several months ago and have played it normally ever since. Everything was fine until I found out I got a crate from twitch drop, but when I used the code it told me to enter game registration code first.
The problem is I deleted the mail from steam which may have my registration code and none of the solutions I've found on Google helps. I can't find cd key anywhere in Steam client.
Is there any way for me to fix this problem?
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