I think the issue there is that those with connections might not be able to post something quite so traceable.
VW is very digital now, I doubt there are printed schedules anymore and a picture of a work computer may raise uncomfortable questions.
It also somewhat depends on if you are following the normal pattern or the extended pattern, though personally why you would follow the extended pattern as a private owner is open to question.
Finally, as has been very apparent in the whole timing belt thread, the schedules and advice have clearly differed in different countries. If you had followed the UK schedule in previous years it would have cost you a lot more than the one the seems to be used in the rest of Europe.
I'd suggest writing and asking either a local dealer or the importer what the service schedule to maintain the warranty on your van is. I think phrased like that might help get an answer as most regions have regulations around warranties such that companies can't force out third party maintenance (much as they might try)
I believe also there is no restriction on individuals using the online service schedule etc at Erwin which would show you your van in detail and is used by dealers and the good independents to keep your service history. It's not free (avoid the dodgy russian attempt at cloning it) but you can pay as you go and most documents can be downloaded
erwin.volkswagen.de