Check that they haven't been shut in a neighbours shed, garage, greenhouse or a nearby empty building. Speak to people who are ?out and about? in your local area ?- mail person, milk deliverer, and newspaper deliverer etc. Ring all your local rescues. ?Contact all vets in the area ? Produce 6 - 8 small adverts on an A4 sheet, print several and put them through doors in at least a 200-yard radius of your home 100?s if necessary. Place an advert in ?the local papers , someone advertised for 9 consecutive weeks then got the cat back, another person advertised for over a year at a vets and was eventually reunited with her much loved cat, so please don?t give up. Make some A4 posters to cover in plastic or laminate and tape to lamp posts bus stops etc. in your local area. Place card ads in your local shops (someone kept an advert in a shop for 6 months then got the cat back) ?Contact the local radio station and ask if the will put an appeal out and to get the horrible bit out of the way phone the local cleansing department. The sooner you start advertising the better the chance of getting your cat back. We would advise that if your cat has been missing a day or two and you then get it back that you keep it in for a while to resettle. Also please advise all those who took note of her disappearance of her return.
There are some organisations with lost and found registers I am sure someone will give you details. The sooner you start to advertise the better.
I would advise you get the little one chipped as soon as she returns.