Private sale eu car , German papers

Hello the following question or facts I bought a car from the EU abroad in 2014 and introduced it to Germany. The car has now German letter and bill. Now I want to sell the car privately within Germany. Can the buyer now register the car with the letter and bill quite normally at the registration office or he needs even more documents ? eVB number etc. is of course clear. Reach my registration office at the moment unfortunately no thanks for your help