I had one, purporting to be from one of the big international carriers, and tricked out to look like one of their emails, with parcel reference etc. It had an attachment but no phone number in the text itself. That was a bit odd, but odder was the word 'Air' in the description, suggesting that this mysterious object had come from abroad (when I had no reason to expect anything flown in) and the absence of any name for me. I didn't open the attachment. I expect the 'carrier' would have asked for a payment for customs fees, inter alia, for this non-existent parcel, to explain why they couldn't attempt to deliver it beforehand