Top forgeries are so similar that it often takes a team of experts independently examining a piece until the fake is detected.

Are you seriously trying to claim that the reason the original Mona Lisa has value (vis-a-vis a high quality forgery) is because of the minute tangible composition of the paint?

I’m sorry, but no. It’s clearly the intangible provenance. Otherwise forgeries wouldn’t fall in value when detected, because after all nothing has changed about their tangible composition.