quadraginta
Becoming Beth
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It looks like just one student Hannah Carbocci is saying a bullet came through a wall. Both of your links reference her.
I think at this time we should say that this is unconfirmed until further notice.
I think at this time we should say that it is confirmed by at least one eyewitness, a high school student named Hannah Carbocci.
What you are asking for is additional confirmation.
I'm not sure why you see fit to cast such doubt on her reporting of what is a relatively trivial point. Cruz wouldn't even have had to be aiming at the walls for bullets to go through them, all he would have had to do is miss something which happened to have a wall behind it.
A typical school corridor wall is going to be rated for 1 hr. fire protection, and if it is a standard stud wall with sheetrock that means it will have 1 layer of 5/8" sheetrock on each side. That wouldn't even slow down a round from an AR15 noticeably.
Considering how many rounds he is supposed to have fired I'd be far more surprised if some bullets didn't go through walls.