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How to take in a stray cat
Make sure the cat you've found is a stray for sure.
Take the cat to a vet and ask them if there is a microchip in the cat. The vet will be able to tell if someone owns the cat if a microchip exists.
The vet may also have notices of any missing cats you can check. If the microchip doesn't exist or the owner cannot be traced this way: leave a message on online sites that help people find lost cats.