ARASH ZEINI: A note on the Schøyen copper scroll. This is a bibliographic note that leads to an article by Étienne de la Vaissière. The scroll itself is a Buddhist donation inscription written in Sanskrit and "Brahmī."
For the Qumran Copper Scroll (and facsimiles of it), see here and links. Inscriptions on metal are rare, but not unknown in the ancient world. Other examples are the gold cuneiform tablet and the gold tablets in Phoenician and Etruscan. A legendary example is mentioned in the Treatise of the Vessels. And the fake metal codices are an infamous and now thoroughly debunked fake example, but some genuine ancient lead inscriptions are noted here, here, and links.