A lot of them have a worked edge or a very sharp edge some may have been used once only. W.e call them "flake tools" or "utilized flakes" Usually the best quality flints were used.
Wells
That is the fun stuff to bring home and study especially if it has some secondary re touch on it. I like that stuff too and had passed it by for many years. Through these forums and good friends I have learned to look a little closer.