Small patinated cabinet

Small old cabinet that has lived well. The doors have lost a bit over time. New hinges, old locks in working order. One side of the cabinet is not painted and is wood color. Why paint a side that is not visible! Dimensions: l 91 X h 143 X d 45 interior: l83 X h 14 X d 35 l 84 X h 25 X d 27 l 84 X h 28 X d 39 l 84 X h 29 X d 27 floor: l 80 X h 27 X d 38.