Holy crap! Where do you live? I need to move there!
These appear to be authentic Native American arrows pre-1900. The flint heads are secured with senew. The zigzag pattern is a common enough pattern seen on knives,arrows and decorated tomahawks (trade 'hawks, but decorated by the Indians). The feathers also latched properly, the patina looks right. These are really an incredible gift! I had one years ago late-period ca. 1890 with trade cut tin tip, but secured the same way. You got an awesome find there!
