Similarly, while mine is not missing the small panel like yours, I did find that most of the plastic holding pins in the engine bay are missing. Probably caused by careless removal on initial attempt (by owner or dealer) to check/change air filter or something like that. I have been meaning to search out where to get those replacement pins. There are two different sizes based on which panel they are holding.
Has anyone managed to find those plastic replacement pins?
2015 K900 - Black on Black, VIP package