Thought I would give you a quick heads up for anyone considering purchasing an Xbox One, especially from likes of Ebay/Gumtree. These sites are flooded with people selling Xbox one's barebones (just the console, no leads or controller, PSU etc)
for example like:
[Only registered and activated users can see links. ]
These have actually been obtained by exploiting a glitch on the Microsoft Advance warranty exchange website whereby they could avoid credit card details being verified on the site meaning replacements could be sent directly to them and exploited several times over.
I believe Microsoft have just started to investigate this and will be banning all these consoles in the near future.