Super cool find! When dumping, be careful of the fragility of the dev kit's storage media. Try to make an image of the disc directly without running it too much to avoid data loss. Hope you manage to preserve this unreleased gem!

If it sounds like a bug, maybe it is! There are some insects that can make surprisingly loud clicking sounds. Ever heard of the Deathwatch beetle? Those little dudes tap on wood to attract mates which could sound like clicking. Check the walls of your closet just in case!