The same can be said for almost everything, really. Egyptians were using mummy wrappings to wrap their lunches because graverobbing was cheaper than paper! All the wood and cloth "artifacts" of native Americans decay and are lost within a generation if not safekept. It takes a particularly successful and forward-thinking society to want to bother to preserve anything.

Now, notably, those old Egyptians DID want to preserve things, it's only the modern ones that were despoiling it. Some major thing must've changed at some point.

But a "true" restoration of the rightful "original" place of these artifacts would be to steal them away, then burn them all, or compost them, or melt them down or whittle them into wood/iron nails and horseshoes. Because that's what happened to all artifacts outside of European domain: Reduced, reused, and recycled, rather than preserved.