Just because they are not listed doesn't mean they are not breeding anymore. Some people may have chosen not to renew their listing this year especially if they haven't gotten many inquiries from that listing. Also, there are more BCOA members who breed than are listed in the online breeder referral.
You can also call the person listed on the AKC website for breeder referral and get a more complete listing and then contact the breeders she provides to see when they have their next litter planned.
Basenji
Parent Club:Basenji Club of America, Inc.
Breeder Referral:Sandy Beaudoin; CST (918) 762-3205