Since stores have to pay to rent a dumpster, and pay for every time that the waste management company has to come empty it, they definitely DO care about illegal dumping and are likely to report anyone they see filling up the dumpster that THEY have to pay for. I know that if I rented a dumpster for a construction project, and if I saw the schmuck down the street dumping his rubbish in it all sneaky-like after dark, if I knew who he was I'd dump that shit RIGHT back on his lawn (probably with the bags ripped open), or call the cops. I'm not paying for some cheapskate to dump for free!