To my knowledge, it hasn't been found. S—so, it would only make sense it is still lurking about. However, it's smart.. to place an organ in a box like that.. it's certainly not something that is completely savage. It has intelligence.. and.. probably usable thumbs.
_{[ It's almost like another sick person did it instead of a monster, which makes Karamatsu feel even worse. What if it was another passenger? ]}