I ran a stsadm -o enumsites and received 2 error messages in the output. It generates the error: The system cannot find the path specified. (Exception from HRESULT: 0x80070003). I know the URL of one of the site collections from doing some web part testing.
I cannot trace down the other site collection. enumallwebs shows nothing for the one collection I know of. The sites do not show up as orphaned.
I'm at a loss as to how to identify these sites and remove them from the configuration database I presume.