Well, it actually turns out that Skype was indeed a blessing in disguise in my case. Fortunately, logs of live text chat documenting every step from receiving the buy request to piecemeal deposit of BTC to buyer's wallet addresses over a period that extended to almost 10 hours with time stamps unequivocally prove that the buyer indeed received the goods in a genuine provable transaction for which buyer made the payment. With this evidence in place the scammer's accomplice is finding it very hard to make his Facebook hack story compelling.  But, of course in any legal system the complainant always has an initial first-to-complain advantage, and burden shifts to the defendant. Without the Skype evidence and my diligence in investigating the scam, the burden would have definitely been much heavier.