Hi Tim,
          it does seem common that sellers often embellish an item with fanciful stories  
 
     I personally think late 19c/early 20c, but,that is just a 'feeling', the patina of the iron heads seems consistent with that sort of age. As does the remaining shafts. 
      I was hoping that this 'group' are a range of spearheads produced by the same tribe/culture, have you any ideas? I have never seen iron banding used to secure the head, before. Only the 'usual' (?), hide or wire (braided and whipped)