Actually, Harry has been found in 2002. I left some clues within the comic (mainly in the conversation between Mercedes and her mother), but you can also read about Peştera cu Oase on Wikipedia, where you'll also find a photo of Harry's skull. It was fun to read how baffled archaeologists were by his partly archaic/Neanderthal, partly modern human features.

(yes, I DID pick the location and skull on purpose; the news about it was published around the time I worked on this particular part of my comic and it was just too good to not use it)