Here's something you can plug into the cronjob section of the panel:
Set to run as the desired user (dropdown menu). The ~ means it'll look in that user's directory. Change the EXAMPLE.COM/etc stuff so it's the proper directory.
Have it run hourly, or daily, or whatever. Have it set to email you the results.
This is the easiest way to accomplish this beyond doing more complex scripting. If you end up with a ton of files, this will no longer be practical, as it'll keep checking the same stuff over and over again, plus whatever is new.