It is a tricky line to follow on this. I was in this same position when I was applying for new jobs while still employed. If I remember, I included the few projects that were on the market as well as products that were not completed or did not make it to market. In my portfolio I mentioned in the description if it was on the market or not and what my role was. In most of my interviews they have understood that not everything can be shown and as long as you can back up your experiences and knowledge they are ok,