It seems that you have been able to glean quite a bit of information from the message board.
Your best bet at this time might be to retain a buyers agent on the island that would primarily represent your interests in any deal. Keep in mind that the listing agents are the sellers representative in Belize. Further, retaining a good lawyer is VERY important to guide you through the methodology of acquiring property in Belize. In the end, protect yourself and your investment before acting.