Lost and found iPhone

If the owner chooses to, they can leave info on a lost mode display message. But it is up to owners to do that if they wish to. Apple doesn’t get involved at all with lost or stolen personal property.

No. Even if Apple could connect the serial number with the original buyer, they will not provide you with that information. It would violate federal privacy laws to do so.

All you can do is turn it into the local police.

Not here.