Erick,
the adress,fax and e-mail of the MB archivs are perfectly right and they are still in business!
I have asked for the certificate last year. I wrote a request whith proof of ownership, simply put 100 euros in the envelope and posted all that to Stuttgart. I waited pehaps 2 monthes before I received the certificate, but it is nice.
If you are a little bit "gambler", try this method!
alain