Never gotten caught. I do it quite often, though not every night. My best personal score was about 30 bagels, and 5 bags of grapes. I only went out for about an hour that night. Fed me and some friends for about 3 days straight. Still have some left over. I know a guy through a guy who came up on 48 boxes of shelf stable soy milk at once, and about 100 apples. As far as tips go, I'd say just don't be a dumbass, and always try to leave it cleaner than when you started.