I just read about Delilah....I'm so sorry. I am praying for her safe return.
I don't know if anyone has suggested this yet but if you can you should put a reward on the fliers and posters to the person who returns her home. I know this sounds awful to think but a friend of mine lost his little guy and when he posted a reward they called and returned him. They had him the whole time he was missing and actually admitted that they had seen the fliers and didn't call till they saw the reward(they had planned on keeping him). Some people...
Good luck..