learlaw, I suggest that when you get him in your new house, that you allow him to explore as cats are wont to do and then feed him something extra-special, whether it is tuna or whatever. Try to retain him in the house for about, as you say, 3 weeks. But he will probably want out before then. I have a few cats in my menagerie that if I do not let them outside at least twice a week, they begin to get bored and fight with the others and otherwise become more destructive than they normally are.

.......wayne