Prayers for a safe return soon. Notify animal control if you haven't already. Leave smelly food outside while you're home and keep checking. Leave something with your cats scent on it outside. Check in bushes, under decks and porches. Also check garages and sheds and ask neighbors to please do the same. I've also heard to empty your vacuum contents around your house helps bring kitties home. Flyers work also and help generate sightings. Pass them out everywhere.