My experience....
RD: 9/19
ND: 11/14
EAD approved: 11/27 (message - a new card has been ordered).
EAD mailed: 11/30 (message - this case has been approved. On Nov. 30
we mailed you a receipt. If 14 days has passed
blah, blah, blah.....give us a call.... blah.)
Received card on 12/7 for self and 12/17 for wife, even though both were post marked 11/30. Christmas delays or misplaced mail is my best guess. Hang in there, you will receive it shortly.