Probably so but at the time it sounded like this person perhaps got whatever information they were looking for.
I wish I could remember where I saw it so I could go back and query for myself and see if I can find out more. By now, there has to...
I was initially concerned myself, if this is not a scamming attempt going on here, but It was an official letter from Fedex, and what they do, to ensure your shipment clears customs as quickly as possible and avoid delays, they typically pay...