I rode the route in the strava link below:
http://www.strava.com/activities/154159463
It has ben spotted by 3 people (one on Facebook, and two I spoke to on the way in this morning. It was spotted near the South Tower, and I guess it came off as I rattled over the rumble strips next to the south bridge tower.
I called in to the bridge office and asked if anything had been handed in. I left my contact details with a note of what is lost.
Thanks folks, I had a good look on the ride over this morning and also on the way back lastnight. I can only guess its been found and someone either thinks they have had a lucky find or they are looking for its owner but have no links to me or my Facebook groups and forums I posted on. I should have written my contact details in it.
Cheers,
Dave C