Indeed..Fitting one looks like the screw has just vibrated loose.
In the case of the PIR one, there's one screw missing from the back of the lamp unit - did you remove it and take it 'out of shot'? If not, are you sure that the screw and eyelet weren't (or weren't meant to be) in that fourth hole?
It does. Do you think they may have been under the impression that it counted as Class II?Fitting two looks a bit more suspect.
Kind Regards, John