you are right, it was not meant as a threat, but honestly I was only meaning to contact him and ask to return the money, no bad intend...let me know if I can help in any way.
In read on rwi that he wanted to solve the matter, the watches were send registered and insured? Then what is the problem, just refund with paypal to the buyers and have postnl start an investigation to find the orders or get your money back from postnl insurance?