I just bought the trekker topcase with the m9 plate as you have, they fit but if you try to lift up the topcase can be removed easily.. And it's locked! Idk what to do, I am going to send the plate back
I found that as well on one or two occasions when it was new. Try giving it a good yank down to ensure it locks. It does get easier to click in with a bit of usage in my little experience. You could also try to push in the top box with the key in the lock position and see if it clicks in. It shouldn't come off if it clicks in /locks, if it does then it could be defective.
Now that you say that I did notice a bit of a wobble recently but that was on rough bouncy road. I can't say I have noticed it being an issue before. It feels rather secure and I have loaded quite a bit in it including camping gear / on top of it.
Hi mine did not come with oem rack , I bought the 1179FZ givi rack. But the plates come with all the screws to fit onto the racks. I am not sure if the plates screw holes line up with oem racks though. best bet is to ask your honda dealer.
