You know, I actually gave this some thought when the episode first aired, and decided that Mestral would make sure that his body would not be discovered after he died.Trip saying that when the Vulcan who stayed behind died they would find his pointed ears but he didn't mention the Vulcan Green blood. If the guy had stayed behind and was found to have pointed ears and Green blood it would have been in the HIstory books.
Maybe he went on some long hike or journey into a remote wilderness where he then died in a location where his Vulcan remains would be consumed by local predators or any skeletal fragments would be quickly buried under foliage, dirt, snow or sand?