We see it differently. I see it as a lot of potentially ignorant, busy, or perhaps forgetful people who might leave personal property on a bus with a sign. And then calling the bus company (city?) to hear that any property left on the bus will become the property of the city. But we issued you a voucher.

Technically all neat and tidy as long as the sign spelled it out. But a very bad experience for those who lost something, even if it is their fault.

But no big deal... we can disagree.