what I did was go day by day until Isabelle says someone moves out, if you walk around someone might ping and say they're moving! Then once you have sold them to someone double check their door and it should say moved out. Save and go back 1 year, run and check the campsite to see if there's anyone good in there. Fast forward a year and check the campsite again. Then fast forward 5 days and someone should be in boxes! Hope that helps!