We moved out of our old apartment the other day into a new, larger place. When we were packing up and cleaning I noticed this little feature in the medicine cabinet.
It had been there the whole time, but the shelf was adjusted so that the slot was covered and I was completely unaware of its presence. So, after my last shave in the old place I deposited my blade. Who knows how long it's been since that slot's been used. I left the shelf adjusted so the slot is exposed. Maybe a DE shaver will move in and use it.