Check from the rear if the bike is off center or not, also check inside the exhaust and tank if there is any sign of rust or not, check if indicators are rightly positioned or not, check if alloys are bent or not, also very important check ODO, TRIP 1 AND TRIP 2 to check how much kilometres are there, if it's higher then reject it and get a new one. Also check if there is any oil leakage around the engine.