The Copper Scrolls
Something interesting to consider about ancient medal artifacts is that you would think they would last longer than something organic like papyrus. What's more likely to happen when people find medal works is that they would 'recycle' it and turn it into something else more useful. Some old markings that someone couldn't even read or appreciate would make for a lot more useful shovel or plow or weapon. Throughout history there are probably many medal things that used to be much older medal things that have been re-fashioned into something else. We do something similar today with certain electronics that use gold and other precious medals. If a satellite is outdated it will be gutted for it's gold which then can be re-used for something else.
"The Copper Scroll (3Q15) is one of the Dead Sea Scrolls found in Cave 3 near Khirbet Qumran, but differs significantly from the others. Whereas the other scrolls are written on parchment or papyrus, this scroll is written on metal: copper mixed with about 1 percent tin. Unlike the others, it is not a literary work, but a list of locations at which various items of gold and silver are buried or hidden. It differs from the other scrolls in its Hebrew (closer to the language of the Mishnah than to the literary Hebrew of the other scrolls, though 4QMMT shares some language characteristics), its orthography (i.e., its spelling), palaeography (forms of letters) and date (c. 50-100 AD, possibly overlapping the latest of the other Qumran manuscripts)"
Wikipedia - Copper Scroll