About my Item, for tracking number RC482774218CN?

Hello, I asked you last time also, that my item is in Shanghai from 19 Mar 2014 , still it is at same place, and you answer me what I also can understand, that item is in Shanghai and you said it is under custom and something. But I want ask that are you sure that it is still in the Shanghai and they didn't deliver it from there? I would like to ask you that can you please tell me the real state of the item that where it is now? may be by investigating there in Shanghai office. I read most answers given on this site, these are just like you are also tracking and giving the same answer what tracking says. But that we also can understand, even I would like to tell you that I do not trust now the tracking system of China Post. So please I expect the real data from real investigation. Thank you in advance for your understanding...