More on this later. Examine your posted flyers frequently and replace the ones that are missing or damaged. Place an Ad in your local newspaper. Some will do this for free. Be sure to advertise in the Sunday edition as well as during the week.
Most newspapers provide free ads to people who have found lost pets.
Also check regularly in any other local publications. Pets have been known to find their way back home after being lost for several months. Take a friend or two along with you. Arrange to meet in a public place. Beware of money scams.