Read the OP with the link to the news attached to it, and you’ll find out. As a bank teller, they are always dealing with money, so it’s easy for them to get tempted, especially if they’re addicted to gambling. And of course, as a bank, they have a system to trace transactions, and probably during an audit, this was discovered. As per report, one of the depositors complained, leading to an investigation that uncovered the entire amount of money being stolen from different depositors.