Finally found a trail register to sign! Nearly halfway through the trail and there is a register at the Mecan River segment. I saw that two thru-hikers signed it way back in June but only a few day-hikers since then. Papa Bear and I left our marks.
By the way, the Mecan River is the fist clear, beautiful river I've seen. It is spring-fed and crystal clear. And, this trail segment is very nice.