Slot in the bottom of a razor blade box

As some have stated it was a used single or double edge safety razor blade disposal where the blades dropped between the walls to be forever

A: My old 1970's metal medicine cabinet has a small opening that I insert the used blades in Or, you could cut a slot on the top of a used plastic

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razor shark slot review slot can also be cut into a medicine cabinet or wall and the blades disposed of that way, or