That is crazy. I have read the news 2 days ago, and it seems like this is just this time. unfortunately I can't take advantage of such an event, because I don't have a bitcoin ATM. Blessed is someone who has got results, of course with the hope that it will repeat itself. But I don't think it will happen again as a machine error.
Why would you 'take advantage' of such an event? Even if such an error (or whatever it was that caused the machine to freak out) happens again, it's not your money. It belongs to the company behind it and you are even committing a crime if you keep the money. It's called theft, regardless of how innocent money laying on the ground may seem to you.
How would you feel if this was your ATM and thus your money that people were picking up off the ground? You would want them to return it to you, right?