My mom found Castle Grey Skull and Snake Mountain at a yard sale when I was a kid. They made great play sets for my Ninja Turtles. The only MOTU figure I ever had was the blue and yellow tornado guy.
At least your parents held onto your shit. My parents either tossed it in the trash or sold it off at a garage sale. All my He-Man, Transformers, Robotech and Star Wars toys gone.
Still have mine in a closet. I was king of the hill when I got it amongst my friends. That carry handle built in made it easy to bring along when setting up epic battles outside with them.