How much would it cost to make a convincing reproduction of this: https://en.wikipedia.org/wiki/Rabbit_(Koons) https://en.wikipedia.org/wiki/Rabbit_(Koons) Or

How much would it cost to make a convincing reproduction of this: https://en.wikipedia.org/wiki/Rabbit_(Koons) https://en.wikipedia.org/wiki/Rabbit_(Koons) Or this: https://en.wikipedia.org/wiki/Black_Square_(painting) https://en.wikipedia.org/wiki/Black_Square_(painting) The value of these artworks is already only in the provenance certificates.