User folder uses more space than my hard drive icon says is available

I just emptied my trash folder and expected my internal Hard Drive space to increase by 2GB however, according to the internal Hard Drive desktop icon it increased by ~34GB. I searched through all my files and can't figure out what's missing. Info about my user folder (⌘-I) displayed it was using 864gb which is what I expected it to be without the extra 30gb... However, my hard drive still indicates 198gb available. Edit: 10 minutes later info ((⌘-I) about my user folder is 1.03tb.

Is it possible that the phantom 30gb does not represent data mistakenly deleted and resulted from some routine/normal background process?

Other than comparing to Time Machine (which was many changes ago) is there a way to find out what files or types of files were deleted, eg. a log, etc?

Thanks in advance!