Your average retail employee is not paid enough to give a shit. Just follow two simple rules: Don't let management catch you, and don't leave trash out. Those things end up making it our problem.
Can also be worth asking if there's an unadvertised sample program. Like at my bakery, we have an option to buy cookies by the pound. I'm not supposed to bring up samples to customers, and they're mainly supposed to be limited to kids, but if anyone asks me? Fuck yeah, which flavor you want? They're mostly going to get tossed out anyway.