I know someone that used to work at pizza hut, their dumpsters almost always have perfectly good, in the box, still warm pizzas in them...over twenty years he's gleaned countless pizzas from several different locations.
I've known a couple other 'divers' over the years too and have heard of their 'scores' similar to those already mentioned...while I can't recall ever pulling anything worthwhile from the dumpster, I can say that I've thrown away alot of perfectly good stuff that really should have been donated to charity but I was young and didn't give a fuck about anything...

years ago I lived in an apartment next door to a cute thirty-something milf, our doors were just a few feet (a meter) apart, one time we both opened our doors at the exact same moment, both headed for the dumpster with our bags of trash, I thought to offer to just take hers with me on my way but chose to have a couple minutes to chat while we walked together instead, I know, how romantic right? ya gotta seize these opportunities...so she and I and her two year old son get to the dumpsters and throw in our shit and the kid says, OH! he bends down and picks up a used condom and tries to throw it away...all I could do was laugh..

I don't care how good it looks, I still can't do it...if it's been in the trash, it's trash
and in the trash there's used condoms...