How did they determine which crypts they needed to search? I was only half paying attention.
I believe they looked at the screws? bolts? fastening devices? that held the faceplates? or whatever they are called onto the crypts. Most of them had rusted fasteners, because the crypts haven’t been openened in a while. A few, including the one that was opened to start the show, had non-rusty fasteners. These were the ones that they needed to search.