我绿卡过期了，过期前申请了N400, 并且打了指纹。刚刚收到offer要换工作，请问8老师这种情况下我是不是只需在护照上加 I-551 stamp就可以去新公司上班？我能否拿N400的receipt或指纹的receipt去移民局的field office 做 I-551 stamp，还是必须renew绿卡(I-90) 后才可以？这两种情况下去field office都要带上什么文件？多谢多谢！！
-If you filed N-400 more than 6 months before your green card expired, you can bring your passport and the N-400 receipt notice to the local USCIS Field Office to get the green card stamp to work. Otherwise, you need to file I-90. Call USCIS first by 1 (800) 375-5283 and then, get USCIS approval to make an appointment.
