Purchased a power adapter (A1265) and a lightning to USB cable for iPhone 5S from an eBay seller (eBay ID: logans1234) 2 weeks ago. The seller described these items as "100% authentic Apple OEM products."
But when compared with my old real Apple product, their power adapter has slightly smaller opening for USB connector and electrical contacts for USB connector inside of the adapter has slightly different shape. Also, their lightning cable does not have "Designed by Apple ..." imprint on it.