Will sell Krad/letter accidentally punched – vehicle registration still available

Hello, I had ordered a motorcycle according to my wishes from a friend, a factory member at BMW several years ago, this was then formally delivered to him, so that he was also registered as the first owner in the vehicle letter. The motorcycle then stood for half a year, until he could formally sell it to me with a few kilometers, which at the time occurred at the overpass. 1. If I want to sell the krad now: I now have to sell myself as a “second wheel” at the sales ad. sitter”, although I have proven to have driven the krad from the beginning (e.g. already carried out the first inspection after the purchase in my name, the initial kilometers are also in the purchase contract) ? I don’t want to get any legal difficulties on the one hand, if I pretend to be the “first owner”, on the other hand also take no big losses at the VK-price … 2. The krad is still registered to me, i.e. there is still the old drive Now I have discovered the vehicle letter, stupidly this was punched (by whom, unfortunately, I don’t remember after all these years) and stuck in the folder. So on page 1 the seal of service of the “first holder” was punched to a small part and in paragraph 33 (page 2, remarks) part of the tyre designation for the rear tyre “holed away”, however, you can still recognize the tyre designation well in the vehicle registration, otherwise only empty fields were punched along. My question : should I have a new vehicle letter issued to the registration office and me (now it’s called different), so that I do not get any difficulties with the future buyer when I sell it, or does this even raise the suspicion of a buyer, if I now “come” with a new paper with a machine over 15 years old? By the way, I also have an “EEC-conformity certificate”, here is also the back tyre designation, which is clearly stated at the Bri ef is just punched, I have to give it to the buyer, right? 3. I feel a bit murky during a test drive, because the bike is still registered for me, if the potential buyer is looking for the width or “builds” an accident. Is there a “pre-contract” for a test ride if necessary without a legal obligation for the buyer to buy the machine immediately – or how do you handle it with the test drive? Thanks already for your answers 🙂