My thoughts….
Our second basenji came from an accidental litter. We had a choice between a boy from the planned-for completely health tested litter, and a boy from an unplanned the litter. The latter pup did come from Fanconi tested parents because she cared enough to have all of her animals tested.
We ended up making our decision based on temperament and friendliness. But it was also highly important to me that for her planned litter she tested for Fanconi, hips and eyes. It was about the kind of breeding practices I wanted to support. Accidental litters can happen to the best of breeders.
You want to find out what this breed means to the person bringing so many puppies into the world. I mean really how much do they really care...you may be completely sold on your individual puppy, but you're supporting someone who would rather keep that extra $130 than Fanconi test the parents, a detriment to the whole breed. In doing so they take the chance of bringing into the world a WHOLE LITTER of puppies at risk for Fanconi. This is not insignificant and something you can just brush off.
In cases like yours a back yard breeder that did not test the parents says they are willing to test your puppy. But you had to insist on it, it's not something they arrived at out of care and concern for the breed's health. And chances are they won't test their next litter.
Think about the kind of breeding practices you want to support.