Without mentioning home safes, consider that people have been burying it safely in the ground for centuries, if not millenia. Look at all the hoards that have been discovered this year alone. Nobody stole it, the Governments did not sieze it, till centuries after the owners had been worm food.
I did know a guy who bought a historic home, and when doing remodeling found over $80,000 in 1920’s/1930’s currency stashed in a burlap sack in between two walls. I’m sure the same could happen with gold.