I have just look on eBay and Facebook Market place and they both have the same serial numbers and the same pictures of the mac and most of the same wording they are different people but it is all the same, but the one on Facebook 190 pounds less on the Facebook one , Shame it is a long way from where I am.
Surely the serial number is unique to the modal you own.
this is the one from facebook .
These are the ones from ebay.
The guy on ebay has got more pictures.The one on ebay must be a scam at that low price.