The Shawshank Redemption The poster

Who put the poster back in place after the daring escape in The Shawshank Redemption? Andy spent months on that tunnel, and covered his tracks thanks to a poster. The hole is only discovered through an unlucky throw of a chess piece. But how did he attach it in place from inside the tunnel? How? Well, it s pretty simple really he probably only stuck it to the wall via the top and let it fall down in place naturally. There you go, not just showing you plot holes, but solving them, too!