did you already register the camera to your account? If yes, you have to transfer the registration to the new owner in order to have a smooth transaction and a happy buyer...
Currently I own Lumix 14mm, CV 25mm, 14-42X, and vintage primes. Yeap I sold a few bodies and kept kit lenses. I will transfer the registration only if asked ;)
Over the next few years I would replace all vintage lenses with modern MF lenses. Trading is new norm.