To be realistic, there really isn't much one can do about this kind of scammer. Bringing the issue up with the "authorities" (postal service, etc.) probably won't result in much because it was an online transaction, with little or no paperwork, receipts, contracts, etc. It's just how it is. Online harassment would be unwise, unless somehow somehow completely anonymous and with unrelated people (4chan?). Not suggesting anything of course.
I've been scammed before in this laser business, with physical proof from the post office that Paypal just wouldn't accept (remember to ALWAYS use online delivery confirmation; paperwork from the Post Office itself won't count, insured or not). It's not a nice feeling at all. In the end though, the best thing for myself was to just count it as a loss and move on. I don't need any more stress related to things I can't change, nor any additional trouble from whatever retribution I try to obtain. It's hard enough to fall asleep with that kind of thing racing through your mind.
The best thing to come out of this was identifying the scammer as Arach so that no additional scamming/profit was attempted. Even though damage has been done, the snake has been removed from the garden. I'm glad there are watchful eyes in this forum.