We have five catz, all “walk-ups.” Taking them in is tough, and expensive. I had to trap one so I talked with a gal I know who traps them all the time. It sounds like you spoke with her as well...’bout the cardboard, good plan. He won’t be able to step around the trigger like catz do.
Good luck! And he won’t flee his territory when you bring him home. You might not see him for a little while....
Thanx CL, we are hoping for the best at Chez WTC tonight.