If a bank left $1b of cash at a bus stop and somebody takes it, it's not an explicit bank robbery, but it's still a theft. This however is worse, as the proper

If a bank left $1b of cash at a bus stop and somebody takes it, it's not an explicit bank robbery, but it's still a theft. This however is worse, as the property they were negligent with wasn't their own property. It's the bank taking your safe deposit contents and leaving it at the bus stop.