They are nothing like indistinguishable and have the exact problems I would look for to see if it was CGI. * The lower edge on the foreground box, particularly

They are nothing like indistinguishable and have the exact problems I would look for to see if it was CGI. * The lower edge on the foreground box, particularly the lower left corner. * The lower edges of the mirror box. * To a lesser extent, the bottom corners of the surrounding box. Once you spend time in rendering, you know where to look for flaws. If your example was animated, it would be obviously rendered.