I imagine the reason Carol pointed out the definition of robbed is because she expected a different story based on the topic. It doesn't make it any less of an issue.

I do think you are very lucky to have not had then take anything but the cash. Only reason for that is they probably didn't want to deal with selling stolen goods. Certainly can make it easier to catch someone. And while hopefully you reported this, much harder to catch people that only took cash versus items that could be more easily identified.