dapple grey

I've read a little bit about dapple horses building up dapples during different seasons, losing/gaining them later, disappearing as they grow older. My boy is 8 years old, in his winter coat, and has some dappling on the rump, gradating to dark legs. I'm curiously trying to predict the future...

I recently bought this dapple grey Missouri Foxtrotter. However, on her papers it lists her as a Chestnut/Chestnut Roan. She just turned 8. Is it possible that she was born that color and then turned dapple grey? Or did she get sold from the breeder with the wrong papers? How could I find out...