So to be clear I've owned a ball for less than a week. It so happened that last Friday was feeding day. I fed a live feeder mouse to him and he had no interest while I was in the room. Took him out and consulted and expert. It was suggested to put the live in and turn off the lights in the room and go away for an hour. I did that cam back and mouse was gone. It worked for me, that's all I'm saying I might have to feed two next time if I can't get larger mice or small rats.
good luck