As a youth, I always looked everywhere for 'Indian arrowheads', to this day I haven't found a one. I did find a 10 million years old petrified shark tooth in the marshes around Charleston once.
You were too close to the coast. If you had driven 50 to 100 miles inland, and looked along low terraces of the Pee Dee, Santee, or Savannah rivers, you could have filled your pockets full of Indian artifacts....I did....:)
(Those lazy Indians along the tidal creeks lived on shellfish, and had no need for weapons...)