Follow Dan's suggestion, but also watch for a GUZ number. This is a number beginning with GUZ, and followed with around 6 or 8 digits. As SOON as you see this number, send an email to the consulate (use their web page) to include the GUZ number and the new address. Do this even if you had already sent them the notification. The GUZ number is what they use to identify your file and make sure it gets to the right place. The GUZ number is issued while the case is at NVC. The first time you see it should be on the notice that it is being forwarded to Guangzhou. Worst case, you can always download the P3 forms and use those once you hear that the P3 has been issued. Thanks again, you guys!