I cannot remember the way, but there is a way. I think it depends upon how you "stop" the LCN scan. If you stop it a certain way, you'll be able to go into the configuration for that frequency and it'll show the LCN for each freq it did find.
When you exit the LCN Finder, you should see a prompt to save what was found. Once you save & exit, then you can 'read' the scanner into Sentinel (or other software), then review the system to see what LCNs were found.
Or, after exiting (and saving), you can go through the "Manage Favorites Lists process & select "Edit" for each site frequency. That will show you the frequency entered. If you then hit Enter, you'll see the LCN found (if any). LCNs not found will still show a 0 (zero) in the LCN field.
Remember that if you save to Sentinel, then later want to re-run the LCN Finder to look for more, the scanner will reset all LCNs to zero, not just the ones not found yet.