After seeing the body, find the screwdriver and maybe-grabbing the Wifi code, I see zero items to help me progress further? I unscrewed the hatches but found no item to help me progress after looking through the house numerous times, perhaps the item is missing? Assuming there's a key somewhere.
Ack - Welp! I'll facepalm for not ever seeing the mirror being interactable, likely having seen that drawers, toilet seats and everything else weren't touchable, I'm guessing my brain just disabled any form of curiosity that a 'Bathroom mirror' of all things would be, where all the other ordinarily-openable things weren't interactable.