[Blue_Runner]

That makes sense. I know trade was fairly common due to the fact that non-indigenous stone tools are found in lots of regions.

Actually its quite common to find stone tools around the encampments and even in their garbage. However the ones you find there have almost always reached their end in terms of usefulness i.e. knifes resharpened to to a nub, tools that were repurposed, or in most cases tools that were broken either during use or during production.

I say "almost always" because a decent albeit smaller percentage of the nicer points I have found were found in the encampments. I don't know that they were thrown away - perhaps they were lost for some reason or left behind in haste.