I, very sorry to hear about your experience.
Not sure what you could do at this point.
Im posting to let you know that I had a similar
I've heard a lot of stories like yours ,so when I started out in this buiness I desided to us Paypal to try to add a little peace of mind.
I had a customer buy an item from me off ebay,
he paid by CC through Paypal.
I was contacted by the customer asing me to ship the Item to a diffrent address than the one ebay had confirmed on file.
I was leary, He then insisted that he arrange shipping and sent me by email, a shipping label and commercial invoice.
Made me even more leary.
Then a second person emailed me and said that they had been scamed and to cancel the order and wanted his money back.
At this point a smelt a rat. So I sat on the item and didn't ship it out.
Three days later my paypal account was limited, pending investigation because they thought someone else had accessed my account.
I had to reverify my ownership of the account.
Turns out the customer had a third party somehow steal his CC info off the internet and also accessed his ebay account and bought my item.
The thief was from Nigeria. Beware of anyone from there !!! not sure there is an honest person in the bunch.
I did end up getting a charge back for the price of the item from the Credit card company. But for some reason I just left the money from that transaction in the paypal account, insted of transferring it to my business account.
I didn't lose anything but the fees for listing the item on ebay ,and still had the item,Thankfully.
Just thought I'd share this with you.
Good luck ,and I hope somehow you get your money back.