Ketomum
You can use a staple but I would recommend punching a hole in the top left corner, to the right of the perforations and use a treasury tag or a piece of ribbon or string with an easy to undo knot to join the documents together.
The form needs to be scanned when it is received, a staple will have to be removed for this to happen whereas a tag or ribbon can easily be removed and hopefully re-attached after.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
