Find Database vs Index Content

Is there a way to search for content in the database vs indexed. Because of the need to keep some original content outside of the database, I’ve about a 50/50 mix of indexed vs imported content.
That said, every so often, I find I import some of my indexed content and would like to move it from one group to the other (I’ve got two parent groups, inbox and inbox-internal)…but don’t see a quick way to search and find this.

Bring up the search window (command-shift-f), click on the ‘Advanced’ button in the search window’s sidebar, and select the criteria 'Instance>is>indexed. You will want to make sure that this criteria is then cleared before you do additional searches where the index status is not relevant.

Perfect. That’s exactly what I was looking for.