They moved the safe into the catacombs far below the building long ago. I remember doing sewerage maintenance in the area a couple of years ago, when we accidentally broke down the cavity's wall. There stood the gilded box among the walls of skulls, everything disturbed by the light, decades old dust resettling.
We chanced a closer look at the thing and after a while something inside it started ticking. When we left, the sound followed us the whole way out.