Missing cat need advice need advice.

2 days ago (5/11) my cat husk went missing near gerbert and huy. This cat is my wife's whole world and we are both incredibly distraught over his disappearance. He's not a very healthy cat and in need of medication. He hates the outside and has never been outside longer than a few minutes so we're shocked he would sneak out. He's the sweetest cat in the world but not the smartest and We are worried about him being outside alone. Here are some things we've tried: Searching our house top to bottom. Placing his litter box outside front and back Placing his bed in a shelter outside Searching the neighborhood at dawn and dusk Talking to all immediate neighbors. Posting flyers all over the neighborhood offering a reward. We looked into drone searches (we were told they would be pointless as we live in the suburbs.) Contacting local vets and providing his chip information and picture I'm hoping for any advice or tricks we haven't tried. We're also worried someone may have just taken him as he is an extremely friendly maine coon (he was a rescue) so we're afraid someone just decided to keep him or try to sell him. A few things were considering and researching now are looking into tracking dogs, and sending out a mass letter to the whole area asking for his return. Any advice on other steps we can take or options to find him would be very much appreciated.