I sold cbat the top box (tried to make a nice quick-disconnect setup using the OEM box and my AltRider rack and could not find a satisfactory solution). No issues at all with installing my lock cylinder and everything worked just fine. I opened/closed the top and the bottom latch many, many times during my fitment process.
So when I shipped the box off, I moved the latch assembly back and secured it in place with the 'shipping screw' and removed my lock. Just like when I received it from Yamaha. Imagine my surprise when cbat said the latch did not work. The pics he sent show his lock cylinder installed correctly but he mentioned seeing a spring visible (thru the lock hole?).
I am curious as to what the mechanism is like and what could be causing the lock cylinder to not rotate. Any pics of this assembly would be great. If the springs are removed, can you turn the the plastic cylinder (the the lock cylinder actually rotates) and see if the mechanism still works?