Just rubbish lah. The etchings show no sign of wear and tear or minor corrosion.
That shows you know nothing about gold and the reason why they are worth value. Read Internet about property of gold.
They last, the don't corrode away, the survive very high temperature, they don't get destroyed easily even in hottest furnace, they melt and solidify nicely as gold still, they survive the strongest alkaline and acid without corrosion. That is why gold is used as gold.