CaptainPike said in
rec.pets.dogs.breeds:

Is there an organization I can call or write to that this
person might have been registered with that may have
archives that were then updated with the original breeder's
change of address?

I assume that you're in the States - have you tried the parent
club, the Basset Hound Club of America?
http://www.basset-bhca.org/

They have a breeder directory, or may remember the breeder.

--
--Matt. Rocky's a Dog.