They’re not gonna let themselves get caught with a dead girl or a live boy
The normal practice in noble burials was to let the bodies decompose and then put the remains in an ossuary, which means bone deposit. Normally it was in or close to the tomb or place where the body had decomposed.
These ossuaries were under a hatch in the floor of the German college (seminary), the tombs had been swept clean, one had new mortar around its door...so I think there’s a problem here. IIRC, they’re opening the ossuaries next week.