Sorry to hear you still haven't found Dexter
A long time ago our family dog jake escaped from our garden. He was gone for 15 days, I was worried sick. I put up posters with a reward if found, I asked every person I saw, daily rang the dog wardens, I searched the local news papers to see if anyone was selling a dog of his description. One day I got a call from a man who had found him, taken him in and was going to keep him! If he hadn't wanted the reward he would never have called me! He'd seen my poster in a local fish & chip shop! I know it's a cat that you've lost so its a little different but there is still hope. Could you maybe have a reward if found? And make posters to put up in shops and lamp posts?
My heart goes out to you, I hope you find him soon xx