Called IIO in December...
She said everything seems to be good and now there's a delay in processing for all the cases these days and if the stamping expire in a year, anytime do a re-stamping. By the time of stamping, they said 6-10 months wait time. Did you talk to IIO?
The AVM/Online Message says from October onwards:
Current Status:
Processing for your Alien Registration Card or Green Card has been completed. Your INS document will be mailed to you as soon as it is ready.