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My name is***** and I am sorry to hear that Scooter is so upset about your move. Moving and change are very difficult for cats as they are very much creatures of habit.
There are no effective ways to catch a cat without using food. I would try the following steps: Have your nephew leave out food and water and move it closer and closer to his apartment until he can convince Scooter to come inside the apartment and trap him inside. If that is not successful, I would consider a live trap. This starts with putting the trap outside and placing food near the trap. Each day you move the food closer and closer to the trap and eventually inside the trap. The live trap works by closing the door behind the cat once it enters the cage and keeps them confined until you release the door. I know that you were not wanting to use food, but I cannot think of any other way to trap a cat without using a tranquilizer dart.
You may also consider contacting your local animal shelter or animal control. They may have other ideas on how to catch a cat.
Good luck to you and Scooter!
I hope this answer helps you. Feel free to contact me if you have any further questions.
Kansas State University
College of Veterinary Medicine Class of 2001