Swap array - list transform.positions

Thank You in advance! I have a grid of instantiated gameobject's and have tagged them as master, I created an array from this 7x7 grid and created a list from those. I am attempting to get the transform.positions from this list and shuffle the list and then replace the grid with the shuffled transform.positions.

  IEnumerator shuffleGrid(){
         GameObject[] gms = GameObject.FindGameObjectsWithTag ("Master");
         List<GameObject> transformsLoc = new List<GameObject>();
         transformsLoc.AddRange(gms);
         foreach (GameObject gm in  transformsLoc)
         {
            Vector3 temp = gm.transform.localPosition; //this gets the list of all  transform.positions - just no idea how to randomize the list of these
            print(temp);
         }
     }
     yield return null;
 }

I have tried many diff things from an extensive google and unity3d search but cant seem to find any good ideas. Thank You again for any assistance AS