Points 1-6 are not helpful but point 7 talks about symlinks. I used the following command as suggested to see if there are any:
dir "%HOMEPATH%\Dropbox" /a:l /s
I get 10,331 hits. Hard to tell with certainty, but it looks like I am getting a list of every single file that has been removed from local storage due to Smart Sync. This makes it impossible (?) to tell whether I have genuine symlinks or not. Could you help?