I had the same problem with the ovservers seat openening up> even with the bow cover on> I think it was because the shocks that were brand new at the time were very strong> and didnt want to stay closed> any little bump would open it up. I returned it back to the Dealer> Larson Marine> and they installed a lock> it looks sweet and worked very well> it was cool because then you could lock your stereo equipment (subs or amps) up> and it would be a little harder for a thief to get to. The lock was black> the face of the lock matched the other locks: ie.> glove box door lock> and the ski locker lock.
Hope that helps.