Scabs with hair shafts falling out - 2 weeks post-op. (photo)

They are most likely scabs or dried up grafts.  They are most likely scabs but it would be difficult to tell as some do look like dried up grafts.

By 12 days post procedure the follicles are fully incorporated into the scalp.What you are seeing is a scab with an associated shaft of hair,not a follicle which is the "seed" for a new hair.

These hairs will sooner or later shed. They are never a problem for new hairs that start to grow. Usually, there is a lag time between the time the hairs shed (2-8 weeks) and the time the new hair grows (3-8 months). IF for any reason, there is an overlap between the two, pay no attention to it for when the new hair grows, the old hairs from the grafts that may persist beyond 8 weeks, will eventually shed