xiaobaitu, green card mailing question help

xiaobai tu:
In case my green card and approval notice was mailed to my old address and was undeliverable, (USCIS need 1 month to update new address in their system after they receive address change request, during which my I-485 was approved)

Is that commmon for USCIS to mail them again to my new address when they found it undeliverable and I moved?

Or do I have to file a I-90 form to request a replacement? For travel purpose, can i go to local office with the hard copy of on line satus update to get a stamp?

Thanks!