Somewhat impossible to answer, as no one here was investigating the crime at the time, but why would the investigators remove the school items from her backpack on top of the bed, and photograph them there? I'm not questioning the authenticity of the photos -- that's definitely her room, items, etc. -- but again, why open the pack, go through the items on top of her bed, and photograph them on her bed? Just seems odd to me. Other than the cellar room, you'd think her bed in her room would be the last place you would dump a backpack and investigate the items, as that was the very last spot she was seen, supposedly of course. I know the sheets were removed, but still.