Very few cats ever find their way home if they escape or are lost.
According to Dr. Linda Lord, an assistant professor of preventive medicine at The Ohio State University, who led a study on the issue of cats and collars:
"The return-to-owner rate is abysmal for cats. Fewer than 2 percent of lost cats are returned to their owners. If we could get cat owners to try using a collar with identification, it would be a big deal."
And per DVM Newsmagazine:
In one community, 40 percent of lost cats were indoor-only cats. Also free-roaming cats without collars are likely to be fed by strangers, thereby reducing the likelihood that they will return home, or ignored as strays, the university reports.