With ferals, since they wander, I have had many vanish and come back. I had one gal, funnyface who is stryker and cleo's mom vanish for a year and a half! Then one night, I get an emergency call from a back street neighbor who had a cat that was really ill and could I come and see to her? I went over there and lo and behold, there was funny face! The old farmer had found her several months prior to calling me, and adopted her, named her Panda and made her his house kitty. She was really sick (blocked) and I took her to the vet the next morning where she got treatment. It was just really neat to see her after all this time. She was my first feral in Oregon, was here and pregnant when we moved in and had 8 kittens (all manx's)
I always worry when they vanish for awhile, but I just pray that God will keep them safe. Some of course, never come home again, but most of them do- eventually.