When i tried to register my secondhand monomachine.
I did not have receipt… and could not get it registered to my name (even with help from elektron), untill
the previous owner was kind enough to unregister it under his name…
But I can imagine a scanned copy of proof of sale, makes a big difrence…
So I agree with poonti … first sort out the “unregistered” machine problem,
by opening a ticket… explain problem, and include scan of proof-of-sale.