there is ethics and there is legality issue
so if you throw anything away, one man's trash is another man's treasure. Video camera is your final evidence.
Many ways you can see this. If you own a store, you already have a good healthy pocket. Give it back don't hurt you much plus there is the law or karma that they possible believing in.
Decision basing upon circumstances. It is a question that you just don't know how to answer until you get there so of speak.