收到一封电邮后到现在啥也没收到，网站上status只说寄出了document
There has been a recent processing action taken on your case.
Receipt Number: XXX
Application Type: I485, APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO
ADJUST STATUS
Your Case Status: Card/ Document Production
On December 3, 2016, we mailed your document for Receipt Number XXX,
directly to the address you gave us. If you do not receive your document by
January 3, 2017, please go to www.uscis.gov/e-request to request the
document be sent to you. If you move, go to www.uscis.gov/addresschange to
give us your new mailing address.
This step applies to applications that result in an applicant receiving a
card (such as a "green card") or other document (such as a naturalization
certificate, employment authorization document, travel document, or advance
parole). Applications will be in this step from the time the order to
produce the card/document is given until the card/document is produced and
mailed to the applicant. You can expect to receive your card/document within
30 days of the approval of your application. If you do not receive your
document, please contact our National Customer Service Center at 1-800-375-
5283.
