According to the show's timeline, the Will went missing roughly three or four days before his "body" showed up. Which means this perfect cadaver facsimile was cooked up in less time than it takes cement to dry. Who the fudge did they commission to make that? Is that something they had to order from some perverted hobbyist, or do they have a wing of their facility devoted to Stan-Winston-style dummy effects? Did some guy in a suit walk into a Halloween outlet and ask if they could make a naked little boy doll on the hush? How were they able to match Will's body type and distinguishing marks with no access to his body? Did they break into his house and search for shirtless photos? There isn't a single option that isn't creepy.
Surely, Japanese body pillow technology hadn't advanced this far in the '80s.
Remember, prior to it happening, this group had no idea Will would go missing in their bizarre dungeon world. That means this flesh-teddy was either conceived in a matter of days, or this dark syndicate happens to have perfect stuffed replicas of everyone in the town just in case. Either option means that only did someone have to suggest this idea to a room full of adult government officials, but also that the idea was praised and actually carried out. Exactly how much of our tax dollars went into child replicas under Reagan?