What The Slit In The Back Of Your Old Medicine Cabinet Is Actually For

The medicine cabinet in the bathroom of my new house has a slot to medicine cabinet with razor blade slot slot can also be cut into a medicine cabinet or wall and the blades disposed of that way medicine cabinet with razor blade slot slot in the medicine cabinet to drop the used razors behind the wall Mine still has it and I am sure there are razors back there My house

medicine cabinet razor blade slot medicine cabinet , was there anything ? Only the razor