Per MSM reports and the PCA, they changed the date of the Elantra AFTER BK was on their radar. They initially put out a call for the Elantra just to local authorities and then were tipped off by WSU parking attendant about BK on November 29th. By early December, they were still looking for 2011- 2013 (see below). So it was sometime after early December that they changed the dates of the Elantra, and BK's name was known to them at that time.
I'm sure that's why the defense wants all the notes because that's not the way the timeline is written in the PCA. Again, I don't know when they had a name so I can't say for sure that they didn't have the car BK drove before examining the footage and reporting on the make and model. I honestly doubt that's what happened, but it's possible. It really kind of defies common sense, though, when you think about it logically. They find out BK drives a white Elantra and they start scouring the footage and there's a white Elantra in the right place and time. What are the odds?
When I read the PCA it seems that they pretty immediately pulled the camera footage. There was a white sedan traveling in the area without a front license plate. If they can show that they had that information before they had BKs name, that's very damning evidence. Very few cars are going to be lacking that front license plate. His is one of them and it's the right color. If I was a jury member, that would be very convincing to me it was BKs car--as long as they didn't have his name when they wrote that in their investigation.
According to the PCA they then provided this video to the FBI, who believed it was a 2011-2013 Elantra. They then provided the video of the car pulled from the WSU cameras and the examiner revised the assessment to say that it was a 2014-2016 Elantra. The examiner will have to explain that revision and if it's because the footage from WSU was better quality or had better angles, that would make sense to me as a juror and I wouldn't find their testimony or expertise not credible because of it.
Now, do we know if they had a name before this revision, no. If they did, the defense should be given that information so they can impeach the credibility of the examiner.
The PCA then says they asked local enforcement agencies to look for the Elantra on 25 November. The PCA doesn't specify which years, but the PCA is generally going in chronological order so it seems to me that they'd already identified 2014-2016 by the 25th. Why they released the earlier years to the public later on, I don't know, but I believe based on the PCA they already knew the correct years by the 25th.
Where the idea of a Sentra comes from, I don't know. Sentra sounds a lot like Elantra so it really could be just a case of mishearing or misreading.