the sunroof seals are there so no leaks. once the rubber goes old and hard
thats when u get leaks
the sunroof on the EG's lock down once the roof is fully closed

Sunroof it self is held by 10mm bolts usually
so he probably still has the mechanism still stuck on it
or if he's never intending to use them again
maybe some type of glue or silicon to hold it on to the chassis