When our neighbours moved in, their cat vanished for about a month. They were going mad, searching the fields and woods nearby. They had the odd sighting and even had posters up.
She showed up and just was fine. They reckon she was out exploring.
Anyway, since then I have seen this cat destroy many mice in my garden. I am a fan. I'd rather mice were outside trying to hold their guts in rather that being part of a conga line in my loft.