This is not the origin of the non-Chinese proverb "no three-hundred taels of silver beneath this ground":
Some guy digs a hole behind his house and put all his life's savings in it. Not feeling particularly secure, he scribbles a message on the wall: "No three-hundred taels of silver beneath this ground". His neighbor Wang gets the message, harvests the ground — and then wrote: "This is not stolen by your neighbor Wang".
There is a Latin phrase that says "Excusatio non petita, accusatio manifesta". Which means "explanation non asked, guilt exposed".