I'd be very surprised if those doors yielded much evidence of anything--they did not make the room a "crime scene" and so there have been any number of people in and out of there, all leaving fingerprints, and no doubt smudging any the "perp" would have left.
But though I hate to say it, I think that it was the whole drift of the suspicion about Westerfield, and the drift of the comments and statements by the VD's-- that have led away from the identification of the girl's own room as the crime scene. We were set up in all ways to think some baddie came in off the street, grabbed a screaming girl and made off with her in his van to some remote spot where unspeakable things were done.
I am on several threads already to say that I think the girl was already dead when taken out of the VD home, and probably from her room! If not, then she left voluntarily. No abduction. Period.
Now I am going to mention the unmentionable. If this girl was killed in her room, it was probably by someone who was sexually assaulting her right there. And that points to Damon Van Dam, not a stranger. AT LAST I HAVE SAID IT.