Under the Civil Code of the PRC and transport regulations, may a driver demand an exorbitant reward or refuse to return lost passenger property unless a large ransom fee is paid?

1. Yes, drivers have full legal ownership of anything left inside their car after 5 minutes
2. No; demanding extortionate rewards or refusing to return lost items constitutes unlawful possession (侵占), though reasonable direct delivery/transportation expenses may be compensated
3. Yes, the standard legal finder reward in China is 80% of the lost item's retail value
4. Yes, if the passenger left the item on a national public holiday