This experience was life changing for me. I'm working on a separate page for food diving. Check back later. I looked, but all I saw was trash. I must be unlucky.
Persistence is everything.
You have to find dumpsters that are consistent providers. I've had quite a few diving proteges online get discouraged during the first week or two until they found dumpsters that produced stuff for them on a regular basis. If you go once or twice and take a peek, chances are you'll see nothing. For every good find you hear about from me or the other veteran divers, there are days when I find nothing particularly great. When I started peeking every day, I found a LOT of stuff.