Fake Burberry?? HELP!?

I recently bought a Burberry coat of off eBay and I am trying to decide if it is real. They guaranteed authenticity on the jacket but I was wondering if you have seen or own a Burberry quilted jacket...is the interior stitiching white? The coat I bought was black and so was the interior stitching but I am almost positive that all the ones I've seen in stores have white stitched on the interior. Please help!!