Honestly, those screenshots aren't evidence considering it can be duplicated by anybody. Example http://image.prntscr.com/image/7dc619e55cd6449ba68a548431673e12.png
and http://image.prntscr.com/image/ba4fede6751d4fb7bb9fa4316a33ee24.png

Items can't be deleted considering it's inventory locked. However you can store them.
You'll need more to suggest any investigation to occur