Blue Sake had both undescended testicles & I had him neutered when he turned 6 months old. He did fine the next day as if he never had the surgery. Maybe Rimadyl had to do with that.
Dogs with cryptorchidism should be removed from the breeding. It's thought to be genetic defect.
I am sure other members have better answers on how to approach your breeder about the undescended testicles. If he/she is a good breeder, he/she would want to know what is going on with the litters.
Best of luck to you.
