Keep listening...you'd be surprised how much you'll get from one person not encrypted. One time I was listening to the FBI where all but one radio was encrypted. The one person that wasn't encrypted repeated EVERYTHING from all other agents said, I guess to make sure he understood everything.
If they are running surveillance, you might want to keep all traffic, communications and names to yourself. I know it can be exciting to listen to and you'll want to tell someone but telling on here might not be the best place. When I found the FBI doing surveillance close to us, I told the wife and actually she'd ask if I've heard anything else and wanted to listen to the recordings. Usually she complains that I have the scanner(s) too loud.