Hm, that is strange indeed for a brandnew unit!
Since you've asked this question, I figure you have suspicions that you have been ripped off by the seller.
How is the unit looking from the outside? Any signs of use there? What was the price for it? Was it a show room model?
Unless you've got it for an unbeatable price, I would send/give the unit back for a new replacement.
Regards / Harry
P.S.: I just powered mine up and checked. 280 hours and that fits.