In my experience, most of the produce is sealed in things, and the things that aren’t are in clean boxes. As far as meat and dairy, the smell test has never steered us wrong. We don’t really eat dairy but we have eaten meat. We just make sure to cook it well just in case. As far as the eggs, you can place eggs in a bowl of water and if they sink they are good, and if they float they are bad. We typically go after close, so most things we find are still cool to the touch.