I doubt Kyron would be attending a school...he is old enough to say his real name, tell a teacher or someone who he is. Whoever would have him would not dare leave him in another's care for 8 hours a day, in my opinion. If he is alive, he is probably being kept inside and home-schooled, if at all. Maybe some years down the road they would relax and get careless, but I doubt it would be so, just a matter of months later. I just don't see it, but of course anything is possible.
Again, I look to Steven Stayner. Within a short time of abducting him, Kenneth Parnell had him attending public school.
As adults, I think we tend to assume that Kyron would know a terrible wrong had been done to him and that all he'd have to do would be tell an adult in a position of authority (police officer, teacher, doctor, etc) in order to have that wrong be reversed.
But when I think about it, I'm not sure that assumption is correct. One thing that has boggled me from the beginning of this case is the number of people who assume that schools are safe havens. I know my schools never felt safe to me, a mixed race kid in the turmoil of the 60s civil rights strife. When something terrible did happen to me at school, I was not in the least bit surprised, I always knew that school was a dangerous place to be. I'm amazed at the number of people for whom school was apparently safe.
Even someone twice Kyron's age when abducted, Elizabeth Smart, was unsure as to who she could trust to rescue her. It took more than an hour of persistent questioning and reassurances before she could actually admit she was Elizabeth Smart.
I think if Kyron were abducted by someone who was kind to him at least part of the time, who told him that his parents had given him away for whatever blah-blah reason, it's likely Kyron would believe them. The manipulative abductor would tell him he had a new name and that the old name was a sad one that no one wanted to hear.
Most kids would then start using the new name and stop using the old one unless adroitly questioned. And outside the Portland area, who would be motivated to question a little boy as to his name?
It wouldn't take long before a manipulative abductor would have Kyron manipulated to the point where he would have no reason to tell anyone his name used to be Kyron.