I fell for a Banknote Scam

I received an order from the USA and the invoice told me a Bank Transfer was being completed. I posted the note (worth £363) by tracking mail as normal. I checked the bank account later only to find no money had come through. I emailed the buyer. ‘Emma Rose’ in New York only to find the email address no longer exists. The address is on Allen Street, so if you have an offer from Emma Rose, DON’T sell!! I contacted Royal Mail to be told the package was in flight over the Atlantic. USPS post could not help so I have lost out. Stupid on my part really, but annoyed and upset to be scammed so easily.