My friend and I just share our phone locations with eachother whenever one of us has a date with someone new. It makes everything dead simple. I can check at any time and see that they are not in a dumpster behind the Aldi.
seriously, stores will just throw away perfectly good food. best before dates are made up and a tin of spaghetti-o's is so filled with preservatives that it would probably outlive most of us, and it's not magically tainted by being in a dumpster.
i'm never going to do it myself but props to people who raid dumpsters for perfectly edible stuff.