We just can't predict their coming's and going's! And, it can be a challenge to get these types trapped. But, just keep on trying and never give up and one day you will succeed in making it a reality! I have had some cats that rarely come through and would see them every few weeks. Usually those types have other feeding resources/stations and ways to keep themselves well fed. It is breeding season too so the males are off for days at a time looking. I know of no way to lure and bribe a Tom cat to your yard or a trap by way of a "fake" cat in heat. Wish it could be that easy.