What I sometimes do is go down to the parts dept of a VW dealership and have them print out a picture, or schematic of the affected area for me. Usually you can figure out then, the method of fastening, and how to remove. I would think VW has some sort of ingenious and hard to find clip that's a PIA to activate to remove, unless you have some special tool to remove it.
Sometimes you can ask a technician one on one, how it's done, and flip him some beer money for the tip or suggestion on how to remove or reinstall. Knowledge and experience is worth something, or you can go the school of hard knocks.
2015 e-Golf SEL
2015 Passat TDI SEL
2014 Touareg TDI LUX
Full spectrum VW owner, life is too short to wait to drive for a recharge.