Most people don't use metals as currency, nor do any significant number tie up all their wealth in metals, nor can metals be deleted by keystrokes, viruses, nor do metals upon discovery, appear as anything but metals, unlike, say squashed and scuffed flash drives amongst rubble, etc.

Metals are a very poor analogy. A better attempt might be to try and analogize it to a currency that plays a significant role in the world's commerce, and has a fixed total quantity, can be deleted, is often unidentifiable as currency if lost, etc.