Haven't caught up yet, but I agree they were interviewed before the 29th and before LE wrote the PCA.
It seems likely the girls were among those in front of the house "crying while draped in emergency blankets." And most likely, IMHO, they were in no condition to give intensive interviews right away. Which makes perfect sense. So IMHO maybe some basic questions at first and interviews set up for later: probably not much later. And IMHO it seems logical there would be several interviews, varying in depth and time, after that. Several considering that, as far as we know, they were the only two people in the house who survived the attack. I don't recall seeing when or if either girl hired an attorney at any point. I would hope they did, because it seems like LE would have come up with new questions as they found new information. IMHO from what we've seen the girls might have been protected to whatever extent from the media, which also makes sense. But protected or not, and lawyered up or not, it seems unlikely that LE stopped questioning them right up to or after the 29th. IMHO. Thus my curiosity.
Link to girls crying while draped in emergency blankets:
Nov. 15—As Moscow grapples with what the city mayor called "senseless acts of violence" that left four University of Idaho students dead, only a limited amount of details have been released about the case. The Moscow Police Department is investigating the alleged homicide after law enforcement...
news.yahoo.com