That corner of the cover was slightly warped, so I was trying to coax it back into place. Finally took 2 flat black hex head STSM screws and, using 2 different sized drill holes, make hold-downs for the corners. Did it when I did the side-hole airbox mod - just on the dirty side of the filter the side of the airbox is cut out and mated to the existing hole in the inner fender sheet metal with a cut foam gasket. Essentially doubles the size of the outside air intake area. These things are already a good CAI, so the trick is to get a bit less restriction in the box while looking stock.
(I am a firm believer in the little saying just under my login ^^^ )