Yo.
Must be official ones by Nintendo, with the matching sleeve and battery cover.
Previously sold on this thread:
Black 3DS Bundle with Nyko battery pack, Mario 3D Land & Mario Kart 7.
Pics:
Spoiler
http://img.photobucket.com/albums/v339/Jiorn/New7_zps1cc1ffc1.jpg
http://img.photobucket.com/albums/v339/Jiorn/New_zps83fc46a6.jpg
http://img.photobucket.com/albums/v339/Jiorn/New3_zpsd6170421.jpg
http://img.photobucket.com/albums/v339/Jiorn/New2_zpsdeef5780.jpg
http://img.photobucket.com/albums/v339/Jiorn/New6_zpsb31108da.jpg
http://img.photobucket.com/albums/v339/Jiorn/New9_zpsf7a38a46.jpg