The bolt will still move back and forth, but the action does not cock or click. Not worried myself, as I am a bit beyond sitting in the gunroom and dry firing my guns. You cannot open the upper from the lower.
I don't know enough about the small parts to say what is right or wrong, but I did pick up a bag-full of EX-1 parts early this summer at the local surplus store. The majority of the 20 change levers that were in the bag were the same as this one. Photos of that haul attached, however the bulk of those parts have moved on.
There are no markings on a Cdn EX-1 magazine....to that end I suppose they are likely bog-standard FN-FAL magazines from the time. I simply recognize them when they are mixed in with surplus magazines at the milsurp yard, and usually have the white DP stripe on them.
One will notice that this particular rifle did have the limiting dowel pin installed to stop the change lever from going to automatic, but at some point it appears to have been driven further in which would have allowed it to go to F/A.