Where are the stock ringtones such as the various Droid ones (Jelly Bean installed new ones) and other stock rings like "Influx" "Light", "Marine", "Momentum" etc

I have installed "ASTRO File", "Files" and "ES File Explorer" but cant located these files/mp3's.

If I search my "Device Storage"/"Media"/"audio"/ I see" Notifications" and "Ringtones", but these files are not located within these folders?

Are they hidden? Where are they? What folder, and how to view?