Transfering Ownership Woes

So...I've been meaning to transfer Tessa's papers into my name for awhile but somehow I put it on the "to-do" list without actually doing it. I decided I'm finally going to get it done otherwise it'll just be put off again. I claimed a year ago that I was going to transfer her papers but not really knowing what it meant or how to go about it. Fast forward to now, I've become an APHA member and have studied how to transfer the papers. Unfortunately, it appears the last owner showing up on her transfer record (on bottom of registration paper) is her breeder. I know she's transferred hands 2 times since but I don't believe the people we bought her from transferred her into their name, or the person before that.

On the back of her paper is the signature of the breeder and the date of sale (over 10 years ago) but nothing else is filled in. So I guess the good news is that I don't have to track down a middle owner to get all the signatures and transfer forms sent in for every owner since. But...now I have to track down her breeder and they sold her 10 years ago. I mean their signature is on Tessa's paper but I'll need it on another transfer form as well, right? So I guess I need to track down her breeder. I have their APHA membership number and the name...the closest I've gotten so far is finding an article from one of the shows they've competed in. Oh, and I found Tessa's half sister lol. I've been following bunny trails and searching key words but I was wondering if there was a better way to do this? I thought perhaps APHA would have some information but I haven't found anything so far...

I guess I'm just asking for someone with experience with a situation like this to help me out. I want to make sure I do this the right way! Thanks