it is a protocol for the teller to follow what the robbery ask for.
they could not offer any chances that the robbery harms anyone in the premises. Big law suit will come after.
and 3000 is a lot already since all the cash withdrawal is centralized with one big machine. You can't get more cash with out higher permission.
so the cash they lost is way lower than the potential law suit expend.
this would not be on the news if this wasn;t in 時代坊.