回复：也可以去local移民局查询，如果是绿卡批准但寄丢了，可以当场

This information usually is not indicated about your case approved. Many attorneys and specialists in this forum think this is the approval of green card. Actually, I do not know exactly what it is, but in my experience,it is not approved for your I-485, or USCIS sends you a piece of information, but probably USCIS made a technical or literal error.This information only shows on your case status or email, but never mail.