Autopsy of aliens

It was the year 1947 when ufologists found out the smashed UFO, at least that is how they identifies the things they have found. Sao, they found the crashed UFO and there was a creature in it. Sure, that creature was already dead and people took it to the morgue in order to perform an autopsy. So, that creature from the UFO was almost like a human being on the outside, though when people opened it up it appeared that organs of this creature are different from organs of humans. Everything in this creature was different from the common organism of a person. So, they realized it was not a human but it was an alien. Though, the question is in case there is one alien on this planet and it is dead now, why those other aliens never tried to find him and bring him back home? Well, I guess it is up to you whether you believe it or not, though me personally, I think in case they find such a creature they would never tell about this found and they will never let all the people in the world know about it until they find out what is it and where it is from.