I think their bodies are probably in bad shape due to the elements--and also because MOO but I think they killed themselves shortly after getting there and have probably been dead a couple of weeks--but I think the proximity to their items, the fact there are 2 of them, and if they are relatively intact, the fact they are two youngish, tall, white men would give them confidence even if they couldn't confidently ID visually them. Because the odds of them being anyone else are pretty slim. I don't know if BS had distinguishing marks beyond his height and thin frame, but KM had distinctive moles on his face that, if still visible, may have provided a quick on-the-spot confirmation for him.