I would actually be interested to find out how points that have been curated (with the site #'s) made it onto the commercial scene? If I were you I wouldn't share this with anyone, I would contact (personally) the state historic preservation officer and return it. Why might you ask? That's pretty self evident, bad juju, and lost history.
I don't mess around with Native stuff anymore, I did when I was a kid but that was cause I was from a rural area and there wasn't anything else to do. I went to school for Archaeology, and the more I did that line of work I was disturbed. I've been to burial rock shelters that folks have dug up and human bones just left strewn on the surface, it's different when you find one in a field walking I know but you get the point. Two years ago, I returned all my points and artifacts (that I found as a kid) to a Lakota medicine man, who cleansed them and reburied them. He also cleansed me of this during a sweat, those spirits went out and were returned to the ancestors. I'm rambling and I might sound a bit crazy, to each their own. Love the white quartz ones though, we dug a lot of those in southwestern Virginia that were associated with a ritual site. This was on Fed land that was slated to become a Stryker brigade stomping ground.
Folks might chew me out on this, and that's fine. Just want you to know I'm not trying to say anything about you, obviously you care about Native artifacts and history otherwise you wouldn't be on Treasurenet. So I meant no offense to you, but this was directed at the seller.