If it has had regular oil changes and servicing then ask for proof and it wants to look genuine.
My clutch got replaced at 160k by me and the parts were about 450.
Prv/scv are about 300-400 inc fitting at a guess.
The rest you should be able to diagnose yourself by giving it a thorough going over.
Start it from cold, leave it ticking over a bit then feel all the gears/clutch/brakes/steering as you move them all through full motion.
Take it for a 20m drive on rural roads plus dual carriageway until it has warmed up completely.
Imo mk7 will always throw the odd noise but as long as it is quiet and pulls well then it is as good as you can expect in the test drive.
A well maintained van will present itself in how it looks, smells, drives.
A shitbox will also present itself.
Unfortunately you can never trust any vehicle 100%
It only takes a broken wire or pin hole to spoil your day.
But you do have us on here if you need us.
https://youtu.be/8hjepidj3I8