pickin , cant see from your piccies but if you have the key open it up and look down the hole in the body of the lock where the shackle has just come from and see if the plug(keyway) is retained in the lock by either a screw mechanism or a screw of some description. if it is unscrew it and then see if the plug drops out. hope that helps.
If I can ever figure out how to take it apart I will post pics for you all.
Im also thinking about trying to cut one of the pair so that you can see how it works just a bit worried I might ruin it without knowing what the guts look like and where to cut.