Lost my battery cover, a few weeks back now, been kind of busy so taken a while to post this - long story but it was not bolted on securely - it has a Willie G Skull series trim band on it, see pic, reward for return thanks.

Have you tried going for a slow ride back along the road where you think you might have lost it?

I did, beagles, but couldn't see it - I was actually worried it had bounced off the road & damaged someones cage, or hurt someone. Unless it ended up in the bush somewhere, who knows. Pretty pissed off with myself as it was totally avoidable.