Audi 100 C4 register

Hello, I would like to register an Audi 100 from abroad here in Germany. The problem is there is only a copy of the vehicle letter. The original has the local authority and is not available. Is the copy sufficient for the re-registration? And do I still have to make a full acceptance at the TÜV, because there were no COC papers for the Audi yet and you need them for a re-registration. Is there anything else I have to pay attention to? LG and thank you