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Beware, it's hidden inside the toilett now - waiting for you to place thine butt on the wing once more so it can extract it's maleficent bug revenge.
Ellie: I had a slice of ham in my hand. I was going to drop it, so I slapped it hard. It attached itself to the wall
Maybe it's El Chupacabra?
Could've been a Hound of Tindalos. They're said to make a scratching or chewing sound when they're near. It would also explain your inability to find any trace of it in the box, as it could have escaped through any of the corners. If I am correct in my theory, your only appropriate course of action would be to immediately find or construct a completely round room (NO corners), and spend the remainder of your life inside it.