Dog Pedigree Help ASAP!!!?

Hello. My little sister recently purchased a boxer puppy. I was doing some research on it and i found out that the Dam of the puppy is AKC certified but the breeder failed to register her. Now the grandparents of the puppy are both registered through AKC. I was trying to get in touch with the original breeder but found no luck. However, fortunately, my sister has copies of the grandparents registration numbers. the grandfather "Sir Benjamin Franklin II- WP98323207" and the grandmother "Bonnie Gaytan- WS11753801" How can i find the history of this puppy?