Im in a rual area. Homes on 1, 3 and 5 aecrs. He was indoor/outdoor into a 1 aecr backyard fenced in 6ft chain link. His habit was to stay in the yard. He didn't like going out front at all. He also would come back to the door to be let in about every hour or two and would come to a whistle. We have been looking every night at about 10pm an 5am in the morning. We also have packs of coons and coyotes. He disappeared at around maybe 6 to 8 am after he was let out that day.
His mom's territory is my yard my two side neighbors and my back neighbor. If anything he could be at the back neighbors but he would be able to hear me from the back fence. The other cat that went missing is a completely out door cat. Its a very weird situation and many others have been losing cats and small dogs recently out here. Even if most of the losses are in the back half of the neighborhood where its more wooded.