If by “perfect copy” you mean a physical copy that cannot be distinguished in a blind testfrom the original in any way, then of course we don’t yet have that capability. Perhaps with advanced scanning and 3D printing that would be possible, but I suspect the true original would still maintain higher value as long as a trustworthy chain of custody was maintained. As soon as a thief removes the original long enough to potentially swap it with a perfect copy, the market value of any alleged original would likely vanish.