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Source (edited): https://freesound.org/people/Breviceps/sounds/448081/ (under Creative Commons 0 license, so you can do anything with it).
It may be that an audio player app won't play the file, because it's so short. But it plays in WhisperWriter.
The sound is meant to be discreet, unobtrusive, not annoying when played for the nth time, and not too loud.