How do I see the entire image in a RAW file with cropping information in non-3:2 aspect ratio?

I have taken some images with an aspect ratio of 1:1 set in my Canon camera, so that it appends the cropping information to the file. I want to be able to see the rest of the image outside the 1:1 box that has been stored in the .CR2 file, but I can't find a way in Lightroom to do this. If I press R to bring up the crop tool, Lightroom does not show any of the image outside the 1:1 box. Opening in Photoshop doesn't help either, whether I open the .CR2 file directly or via Lightroom.

I know this information must be there. In my Canon manual it says: "JPEG images will be saved with the set aspect ratio. RAW images will always be saved with the [3:2] aspect ratio ... the aspect ratio information is appended to the RAW image". Additionally the entire image is shown in Preview and also the file thumbnail in Finder.