I am sure that nowadays BP not have many informations about their vintage FF's. I also believe that the most watches were made by order in the past, and that there exist such a variety of different models that it is nearly impossible, even for them, to get a through view!! I can only talk for myself, getting CoA's for my vintage watches was very easy and without any problem!! They are very helpfully and the contact is very professional, nice and special!!!
best
claude