My AOS application along with EAD & AP applications were accepted on 12/11/13. Although my I765 was approved on 02/12/14 I never got it since one month passed. We highly suspected that it's lost in mail by USPS so we called the USPS customer service and the consumer affairs. In your case, I don't know any way else but keep calling USCIS. Since you got the case number, I think it's at least a good sign that they had your case marked. All I can say is being patient. Good luck!
Yongqing got a reaction from vkhutchings in December 2013 AOS Filers