It is something that would have been spotted when the potential customer checked the camera out in the shop, while making the purchase.I would be concerned about that if it was me.
Never heard of a retailer checking brand new boxed cameras before so that seem's extremely odd, definitely wasn't a practice L.C.E did the last time I purchased a body from them as I had a body arrive dead on arrival from them a couple of years ago.
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So the purchase never happened - the camera went to be repaired, while a different camera was then sold to that customer.
The extended warranty gives you a pdf copy of the 2 year warranty, with the serial number on it. If Sony did question it at a later date then I'd expect that such a document would make it difficult to claim it was not covered.
