A month ago I decided to lock up a set of old wheels and a frame, just for fun to see if they'd get stolen. Its pretty nice gear, so I imagined it would be pretty tempting. I locked them up within sight of three bike stores, so more than likely people interested in bikes would see them. It's also a pretty industrial area, with scrap metal yards and the like, so there are plenty of people around with the appropriate heavy duty gear for use in attempting to break locks.
To lock them up I used four BI5 locks. It wasn't necessary to use four, but I wanted everything to stay close to the fence, and not get in anyone's way.
Too my surprise, a month later when I went to check, everything was still there. I was a bit surprised, maybe it looked like all the good bits had been taken.
I'll keep an eye on it, but I should really pass the goods to someone who can make good use of it.