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My advice would be to go through a timeline to assert the activity before and after these files "appeared" . This can be done in log2timeline / plaso , this script can parse the raw image (or e01 or whatever you have) and build a timeline , parse it and sort it. Also look for lnk files and shellbags to see if the files were opened , used etc.
I'm gonna suggest you also take a look in IPED. It was developed by Brazilian Federal Police. https://github.com/sepinf-inc/IPED