I don't have these stubble hairs anymore but I don't think they grew either. The crown part of my transplant was pretty pointless, I don't think many multi grafts grew at all.
This makes you wonder, why extract them in the first place if survival rate is not good? Almost three years now since my transplant, I remember I sent an email to Asmed around the time I created this thread asking about the stubble hairs but they never replied.