From Silent Hill wiki, article “Silent Hill Secrets and Unlockables”: In the construction site, there is a discolored wall in the same area with the mattress and the hole. If Heather uses a battering weapon to break the wall, she will find a Silencer and a pair of legs. Heather comments on how the legs remind her of “The Black Cat” by Edgar Allen Poe, where a man accidentally kills his wife and hides her corpse behind a wall: “I made no doubt that I could readily displace the bricks at this point, insert the corpse, and wall the hole up as before.” However, Konami has stated that the corpse behind the wall was supposed to be a cameo of Solid Snake from the Metal Gear series, hence the military fatigues the corpse wears, and the silencer belonged to him.
Snake, don’t ever go to Silent Hill.