Allow for father’s car?

Hi, I bought a used car in cash. The insurer is my father, super insurance policy. well, he currently has absolutely no time to drive with me to the registration office he thought it was enough if he gave me a proxy. Ok so far true that sure but what must be in the authorization? Since car still has to be fetched the insurance has sent me the EVB number for that short-term license plate and for that correct license plate. ole I go there right around the corner to the registration office and get the KZK afterwards I drive to “my” registration office and let the car “right”. Does he have to issue me 2 authorizations or what is that? Thank you, nice day Edit: And what kind of documents do I need for the KZK and the normal registration plates?