Login without HU report?

Hello, I bought a car on Sunday, unfortunately the previous owner did not get a report on the purchase. He could register the car with the Fzg. Schein. But I don’t have a HU report or a stamp / seal. And no one knew where he was last at the HU. Now my question is, is it enough to register the Fzg Schein next HU appointment or do I need the HU report? Can I find out somewhere where he was last at the HU war? Is there possibly a central office? Register? I am grateful for every help!