I also wonder how many of those are from people who just don't keep track of paying their bills and therefore just don't pay them on time or after moving, a closing bill isn't forwarded. When I closed my fathers telephone account, I was told that there might be a charge for three months of call forwarding. I received a bill for the last month without the forwarding charge. I never received an additional bill. The estate is closed, and mail forwarding expires after a year. If they decided at some time to try to charge it, I would have no way of knowing.