I think the issue here is even though your uncle bought them, it is like buying a DVD. You cannot buy a DVD, decide you don't need it anymore, then give it to someone else to cut the video apart to make something else...it is still copywrite infringement. You need permission from the "Original" author who created them, and that site is more than likely where he got them from as the file names match up perfectly with that site.
That being said, I have emailed the author listed at that site to ask his permission to use the images from those flash templates to make themes. as the copywrite that is posted there clearly states that you cannot use or modify the files from those templates for any other purpose than for the flash based web site.