Here’s a quick and dirty way to find pages from your domain that are in Google’s Supplemental Results:
I don’t know how much longer this will work since Google did away with the previous way to find supplemental results and claims to be rolling these into their standard results. But, for now, this will work.
Note – Right after I posted this, Google dropped the “Supplemental Results” tag, meaning if you use the search above, you’ll get a page of Supplemental Results, they just won’t be labeled as such. The Supplemental Results are still with us at the moment. Google just doesn’t want us to see them.