Last spring, I slipped on a patch of ice, fell and hit the back of my head hard enough that I broke the back of my helmet. On that piece was attached my tail light. Didn't notice until I stopped another 30 minutes later. When I commuted back on my way home, I tried to look for the light but it was gone. Yes, I lost it but it would have been nice to recover it. So, I leave stuff where they are, who knows if the person who lost it will try to recover it...