The cover plate and the mounting screws are not finish items; they are the barrier that keeps fingers away from live parts. A receptacle's terminal screws sit at its sides and remain energised whether or not anything is plugged in, so a missing plate exposes them directly. A device loose in its box compounds the problem by letting the receptacle move back and shift within the opening, which enlarges the gap and can flex the conductors at the terminals. The location makes it worse still: a bathroom sink means water, wet hands and a grounded plumbing path, which is exactly the combination that turns contact into a serious shock. This is reported as a safety defect, and the presence or absence of GFCI protection does not change that, because GFCI protects against a ground fault rather than against contact between two energised terminals.