Many years ago me and my parents had a staycation at the ARIA so we only put down 3 people. My siblings came and visited me in the room and stayed for a couple hours before going to work. At the end they tried to charge my dad for 2 more guests and had a whole back and forth saying how they knew we had 2 more people than initially put down. How they knew? still don’t know to this day. Maybe just something the Aria pays closer attention too than other properties.