Switch on any of the switch then switch off it , then switch on another button. now enter the room where lamps are kept. Now the switch dat you turned on first would belong to the lamp that is hot. the lamp which is on would belong to the switch which is on. the lamp which is not on and not even hot will belong to the switch that you haven't touch.
I will touch the bulbs ..becouse bulb must be heat..after i will find..which switchs are connect the bulbs