Have you considered trying to get them back into the hands of a group of local indians, who might be interested in them,
in light of their historical significance? I'm not preaching, or down-talking. But, that is a very nice collection of, not only
arrowheads, but some other nice indian artifacts. You might be able to find out, through a town office about any indians/
indian groups in your area, or the area your Dad found the points/artifacts in.
Great collection. (If it was just points, then I would never have suggested returning the whole collection. And, perhaps
you could sell the points and put the other artifacts in a local museum.) Whatever you decide, your Dad did good in finding/
keeping/showing them.