Not sure what's going on, but with experience from having friends on missions, I can tell you that generally mormon missionaries are only allowed access to the internet/telephone once per week. In fact, one of my friends was only allowed to contact his own family via telephone twice per year. Once on Christmas, and once on Mother's Day. They communicate primarily through written letters, and the fact that he is in Honduras in what is probably a fairly undeveloped area probably makes it harder to communicate with the outside world. It also doesn't matter when we receive the LOI, it only matters that he signs it within the signing period.