Today I and spouse got our I-551 stamp in the passport at USCIS, Columbus-OH. Currently Columbus, OH do not have infopass appointment system. We walked in at 10AM and provided I-485 approval notices, 2 PP photos with A# and name written on back using pencil, I-94 cards (1 from H1B extension and one from port of entry), all EAD's and AP's (USCIS will shread these documents per IIO). In queue there were about 20 people and we had to wait for 1.5 hours to get our passport stamped after submitting all paperwork. There are only 2 IIO's working (in 2 windows).