I was playing my first hole when I drove it into the trees. I couldn't find it and I went back to the tee to play another ball. I then duffed it, and hit it again. When I walked to my playing partner he had found my ball. Can I play this original ball? Was it declared lost when I went back to the tee? And out of curiosity, when your partner says 'you go back to the tee, I'll keeping looking...', is this pointless?