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I would guess that, being in a similar orbit, much of it would have re-impacted at a later date, but might some of it be preserved in the form of Earth Trojans, the Asteroid Belt, or NEOs?
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As far as we know, there are no Earth Trojans (that is, none have been found despite extensive searches). NEOs are comparatively short-lived: their orbits decay slowly (on a timescale of some millions of years) due to non-gravitative forces acting on them. Some of them are eventually picked up by planets, the other ones by the sun. I would guess that the asteroid belt is to far away to have retained a significant portion of the collision debris.
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It would be a marvelous thing to study, I would think.
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It would certainly be interesting, although I wonder if there would be any difference to material from the moon. We probably couldn't tell the difference.