I am looking to replace my back case because there are dents and cracks. I don't want cheap china made clones. Would this product on ebay be real oem or imitation: http://cgi.ebay.com/iPhone-3G-16GB-ORIGINAL-OEM-BACK-COVER-FASCIA-BLACK-c_W0QQitemZ180351861314QQcmdZViewItemQQptZPDA_Accessories?hash=item29fdcf0242&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A16|39%3A1|240%3A1318|301%3A0|293%3A1|294%3A50