Electrolytic capacitor markings and silkscreens can be easily misinterpreted. It's also possible the SS is wrong and rather than scrap the boards ASUS used them anyway thinking nobody would ever notice or care. If the board has been running all these years well enough that the owner still wants it I would replace the caps as they were. That said, IMHO you are doing your friend no favor by by putting this much time, effort and money into replacing components on this MB. If these caps are failing, what will fail next and how soon?