To be pedigree and registered they SHOULD have ear identification, two lots, one breeders ID no. second BPA ID no. You should not have to contact the BPA for registration, the breeder should have already birth notified the litter, and then registered your 3 as pedigrees. It is a common misconception that piglets from a purebred litter (even when the parents are both registered) are pedigree. In fact until they are registered they are just purebred its the papers that prove the pedigree. You should have received paperwork form BPA (even if you are not a member) with the pigs registration details and numbers.
HM