Hi just thought I would mention that my genuine Suzuki top box refused to open with the key when I got to the bmf so instead of destroying it, to open it, I drilled a small hole (carefully with a terminal screwdriver) in line with the lock and immediately above the sealing band in the lid. I was then able to gently push the retaining catch back to open the lid. I could then close it again for the trip home and open it the same way with the screwdriver. I found that the nut had undone dropped on the road but the hole is too small (fortunately) to allow the plastic cam to disappear as well. I managed to put the cam back on and find a (peculiar size) 13mm nut which I loctited on. All I did then was to use blu tak for the small hole and touch it up black. Fiddly job but well worthwhile not destroying your topbox .