on 21-04-2017 10:39 AM
on 21-04-2017 1:46 PM
The buyer hasn't paid. They are not sold. You have received a fake email.
When you do sell them, you need to change your postage method to special delivery. Sending a £500 item by standard 1st class post is another easy way to be scammed. You need a signature, and full insurance cover.