This is a fascinating area. Of we do have "materials" here that came from outside of our solar system because we all contain atoms with higher atomic numbers than helium, like carbon, oxygen etc, that have been through multiple solar "cycles" that gradually make higher atomic number atoms as stars go through the ages. So you and I are both made of matter that came that way, from outside the solar system.

Of course it's different if we have rocks or some such that we could tell came directly out of the solar system, and not assembled directly here.