You need to post a private email address where someone could respond if they have information and they dont want to post it on a public message board. You will also need to post their full names. No... email and phones are not difficult to access here in Belize, they would just purchase a BTL tele-card and use any public or private phone, and internet cafe's are everywhere in Belize, each town seems to have at least one. Here on Caye Caulker we have 3. You also might want to make a web page in yahoo and post their pictures. People might not recognize the names, but recognize faces.
If you do these things, it will be easier for people to help you find them, even the U.S. Embassy will want this information.