Agreed. CC chief Walker never divulged when the Grandmothers said they last saw the boys. He did say a while back that he thought the grandmother in Bakersfield was the last sighting aside from the adopted parents (and said “grandmas” in most recent interview with Perla), but never gave a date.
We do know that neither Grandma made public pleas in the days and first 2 weeks after the boys were reported missing. JMO- I speculate they knew something wasn’t right about the missing report or else they would have been searching, pleading, posting missing posters, echoing the APs.