Yeah, possibly. But still, I know Geologist know the biggest mountain ranges, that they have probes of stratum of even smaller areas. But still, drills are expensive, deeper drills of course even more. If you probe somewhere, you don't know if the whole region has the same layers of rocks with the same minerals which indicate oil or other commodities.
But still, the Pacific or Atlantic are not fully researched, Arctic and Antarctica are not fully researched with and probed. And most of the mountain ranges who are hard to logistically get to, are just hardly probed.
So nope, nobody knows how much oil is out there, and when he/she says so, you know immediately who is lying. And models of how much oil is out there, are just that, models, models always deviate heavily from reality. In that case far to much.
And the same thing is relevant for Copper. I wouldn't hold my horses if Copper gets that rare, maybe, I highly doubt it.