"Now listen, you rich people, weep and wail because of the misery that is coming on you. Your wealth has rotted, and moths have eaten your clothes. Your gold and silver are corroded. Their corrosion will testify against you and eat your flesh like fire. You have hoarded wealth in the last days. Look! The wages you failed to pay the workers who mowed your fields are crying out against you. The cries of the harvesters have reached the ears of the Lord Almighty. You have lived on earth in luxury and self-indulgence. You have fattened yourselves in the day of slaughter. You have condemned and murdered the innocent one, who was not opposing you."
https://www.biblegateway.com/passage/?search=James%205%3A1-6&version=NIV
Banks do manipulate precious metals prices through fake supply numbers. It's virtual, though, so hard to imagine corrosion there. Just corruption.
Don't they have audits?
If they do then they're not very effective: https://www.businessinsider.com/jpmorgans-nickel-bags-turned-out-to-filled-with-stones-2023-3
Numbers can always be played with and manipulation can take many forms, not just in supply but also just with trading: https://www.justice.gov/opa/pr/jpmorgan-chase-co-agrees-pay-920-million-connection-schemes-defraud-precious-metals-and-us