How to las vegas post office work?? When the package arrives in the so whether her first?? "you have mail" or will he pick up the post office?

Are you talking about a general delivery package or shipping something to someone who has a physical address? If they have an address they will deliver it to a mail box. If it won't fit they might put it in a parcel box and put the key in the mailbox. If it is too big for a parcel box they may leave it at the door, or if in apartment complex it might be left at the office, with a note in the mailbox telling them that..

If it is general delivery, the person will have to go the post office and show a picture ID. The post office will hold it for 30 days.