As I understand it, the Cellar Series were prone to issues for a while. A good many tins I've seen seem ok though. I decided to forgo any purchases. They were reputed to mature over years in the tin before opening. I wasn't willing to wait 5-10 years to find mold.
Cellar Series, the whole idea is something that I don't take too seriously, as I don't want anything in my cellar that doesn't smoke good here and now and I definitely don't want to wait 10-15 years to find out that my Chenet's Cake has mellowed out way too much or even worse has become a science project. In all my experience with pipe tobacco a product that you don't like fresh is usually not going to all of sudden become awesome in 10 years. Smoke for the now.