The more posters & postcard with pictures you put out the better!! Someone will eventually see it and think "hey, that looks like the dog in the picture!!" My cousin had a little pug that escaped in West Hollywood!! Hollywood of ALL places! She had just about given up when A MONTH LATER, she got a call from someone who had seen her baby! She took her BIG dad and went to the location and had the police (LA police also!!), and they got her baby back
They could not provide proof of ownership and my cousin did. JUST DON'T GIVE UP!!!
In the other thread, someone mentioned Vistaprint.com where you can make postcards/flyers and I think you get the first 100 for free. It's a great website! You should definitely check that out, because that other site you mentioned is a rip-off!!
**If you want, I can make some postcards for you on the website and gather a bunch of local Witchita addresses, and mail them out for you?? I know you're SO busy, so I would LOVE to help. PM me if you want me to do this. I honestly don't mind one bit! I would be happy to do it. I know how you feel about asking for help, but I'm telling you, I would be so happy to help you in anyway I can. 
**