I randomly saw your post in a cycling thread and thought I'd explain some stuff to you.
in boxes: when someone has a villager that is 100% ready to move out.
lurkers: people that sign up at a cycling thread. They pick a villager or three or whatever the allowed amount is, and when that villager gets in boxes, they are notified. Remember that this almost always does not actually guarantee them getting the villager, only that they are notified.
reservation: when you reserve a villager for yourself, you usually pay an extra fee to ensure that you get the villager when they get in boxes.