naruto i also asked myself this same question and i put it as a possibility. the only thing is that his original body would be missing his left hand. but of course that wouldn't mean much since orochimaru knows a way to regrow missing limbs. but then again orochimaru's goal was to achieve immortality and he wanted strong bodies for that. orochimaru even said it himself that kimmimaru's body was the strongest due to his kekkei genkai and he also wanted sasuke's sharingan.
well my point is that i don't think orochimaru has his original body since there were bodies i.e. kimimaru and sasuke that he probably thought were better than his, so there would be no need for his original body. also if he had any attachment to his original body that would hinder him from achieving immortality anyways. i mean part of his immortality was to get into stronger bodies so what would be the point of going back to his weaker older body.