You might post on the Facebook international basenji board.. not a lot of members, but who knows.
Found-CA-Manteca-Female B or B/Terrier Mix Red & White Puppy
This female red & white pup approximately 4 months old was found near the Manteca Bike Trail. She is being listed by a rescue on Petfinder and the group does not know if she is a B or not. She was wearing a blue collar with no tags and is not microchipped. She is a cutie though!
Manteca CA is located SE of Stockton, NE of Tracy, and NW of Modesto.
Here is her Petfinder webpage:
Oh, very cute..she sure looks PB to my untrained eye.