Yeah - the plastic inserts are there.
I was thinking that they maybe could have been fitted without VW drilling all of the additional holes in the factory - I now have to buy blanking bolts to seal up those holes!
I guess it might be an engineer at VW who has come up with a calculation that the additional holes are required if someone was placing say a large roof box on there van travelling at 120 on the autobahn…….
Depends really what you want to do with them I guess