i have a number of 4,000 + year old points that have been rolling around in the surf on the beach for ...well....4,000 + years. They are smoother to be sure, the "sharpness" to the edges are gone, but they are still unmistakable as points. As for other tools, I have a lot of those too, but a million year old river polish is different than a surf or river polish. And they "feel" different too. Kinda hard to explain in words but a natural polish is like "velvet" and all over uniformly so...it has a kind of "skin" to it. Remember too that most artifacts have an obvious function and show use wear. And many, by no mean all, but many were obviously made to be hafted and show this in design. You have a good collection of true artifacts an seem it have a keen eye. You are hunting in the right place to be sure.