There seems to have been a total of 526 Nissan Interstar registered in Denmark. 200 listed as "retired" (this includes ones that got wrecked), 189 exported and, as already mentioned, 136 still registered.
It's worth remembering, that in Denmark, the term "retired" can cover anything from a 1-day temporary break while changing owners, to the car actually having been scrapped, exported without reporting (many of the ex-danish cars seen on this site, running on fake danish plates in Ukraine and similar are never reported as exports)
The swedish site
https://biluppgifter.se/fordon/ claims that "

u kan ange registreringsnummer eller VIN (chassinummer) i din sökning", but if you enter a VIN, it just says that "Angivet registreringsnummer finns inte i fordonsregistret" - in other words, it thinks that the VIN entered is a license plate. I haven't found a way to make it recognize a VIN as a VIN.
For Germany, it's a hopeless cause. They're completely hysterical about "privacy protection" - I know that a searchable database exists there, but there's no public access.
In Denmark, you can't really see much about ownership. You can see the names and locations of MOT sites used, and if there's any debt registered, you can see the name of the debitor. For a short period, it was also possible to see the town and zip-code of the owner, but people complained about that, so this info is no longer available.