On various occasions while cleaning up plastic out of Sydney Harbour foreshore while going for a swim. We spend more time collecting rubbish than swimming, we found two $5 notes on separate occasions & on a third occasion a $20 note, all in reasonably good condition.

Actually didn't even actually notice until we were putting the next handful of rubbish in the bag. Amongst the plastic food containers, parking tickets (floating from Sydney CBD), condoms, straws packets, fast food wrappers, pill zip packets, tangled fishing lines, bait bags, plus a few unmentionable items (not necessarily in that order).

The only thing of any value we have found in amongst plastic rubbish washing onto our beaches is a Glaucus atlanticus (blue sea dragon), they get their blue colour from eating Blue Bottles, which they save the poison for protection from other animals up the food chain. We set it free in a cleaner area.