Full or empty is personal preference. We drain all of our cans so we don't run the risk of having them leak all over. IMO it doesn't affect the value. I don't really think lidded or not lidded has a bearing on value, either. DB can re-lid them if they don't have lids, so that may lower the value by $20 or so. Kinda depends what the can is worth in the first place, to me.