New car bought and now dealer “insolvent”

Moin, a colleague of mine bought a golf station wagon from a VW dealership and also picked it up in Wolfsburg (with a short-term license plate). However, he cannot allow the car to himself, because the dealer does not have the money to trigger the car at VW, so the letter is not sent to the dealer. So she says from the seller. The car is mostly financed by the VW bank. Does my colleague have a possibility to get to the papers somehow different from that about the dealer . e.g. contact VW that they send the letter to the registration office, then allow cars to activate the financing at all times? Has one of you ever had such a case?