There are court cases on record in which the police retrieved a murder weapon or whatever from a private dumpster and couldn't use it because they took it--private property--without a search warrant. So they wait until the trash truck dumps the refuse into the truck, but hasn't yet completed the mechanism that moves it into everybody else's trash. No dice. It still is not public property until it is added to the general trash of everybody else. (I hate the legal system sometimes.)
So technically, taking stuff out of a private trash receptacle or dumpster is theft or illegal appropriation of private property and is also an unlawful tresspass. And in truth, it would bother me if I found somebody going through our trash caddy on trash day. If the person is truly hungry they will be fed from my fridge or pantry. But otherwise, I really don't want people going through my trash.
So technically, taking stuff out of a private trash receptacle or dumpster is theft or illegal appropriation of private property and is also an unlawful tresspass. And in truth, it would bother me if I found somebody going through our trash caddy on trash day. If the person is truly hungry they will be fed from my fridge or pantry. But otherwise, I really don't want people going through my trash.