They couldn’t find them for three days, they went to preheat the oven because apparently they don’t use it much. They found melty glasses, isn’t too hard to imagine. What I don’t understand more is why they were placed in there. What situation would lead to someone putting their glasses in the oven.
I assume they’re reading glasses, because at least when I wore glasses before LASIK I would know immediately if I wasn’t wearing my glasses. A lot of people hang their reading glasses on their shirt collar or on top of their head, I could see them falling off while pulling something out of the oven without realizing.