Quote Originally Posted by WeirdBits View Post
Overlap a small strip of copper tape to the one of the screw holes in each cover's recess. Then, with an appropriately shielded cover, when it's screwed down you'll have continuity to the cover.

Try to cover any gaps wherever possible, you don't want breaks in your shielding if you can avoid it.
Thanks Wierdy, message received!! I've done the covers, so I'll make sure there is a connection between the two.