Yes, I was in a similar position having bought a used M9 from a private party. He had registered it on the Leica Owners Area, and for unknown reasons was reluctant to de-register it, an easy procedure.
So I sent mail to Leica in Solms with a copy of the sales receipt with the serial number and of course name of the seller, and they cleared the way for me to re-register it.
When I later sold the M9 through a dealer, as soon as I had confirmation that the sale was final, I went to the Owners Area on the Leica website and de-registered it.
Doug
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