Today I received mail notification from YouTube making the following statement:
Dear ImphenziaGames,

Your video, (very early) Preview, may have
content that is owned or licensed by Kontor New Media. 

No action is required on your part; however, if you are
interested in learning how this affects your video, please
visit the Content ID Matches section of your account for
more information.

- The YouTube Team

When I Googled "Kontor New Media" another unfortunate YouTube had his videos containing sounds from a bird nest identified as infringing on copyright belonging to Kontor New Media.

I don't think the audio recognition YouTube uses work too well for non-musical audio.

The mail also "kindly" reminds me that I don't have to do anything and this is because Kontor New Media now earns on adverts that appear in my video. I'm not happy with this, of course, so what I did in an attempt to rectify this was to take the following actions:

  1. Clicked on the URL in the mail bringing me to the Content ID Matches section at YouTube

  2. Click on the Matched third party content. text hyperlink next to the video (note: difficult to see that it's a clickable link) - I highlighted it in yellow below.

  3. Follow the instructions to file a dispute that the video was misidentified using the alternative: 1. This video does not feature the third-party copyrighted material at issue. My video was misidentified as containing this material.

Not sure what to expect in terms of how long I have to wait - but I'll update this post once the issue has been resolved.