Hi fellows, my mother-in-law just came on SB1 visa. (returning resident visa). Now, there is an IV stamp in her passport. Where is the A#? I am trying to fill up her I-90 because she has not received her physical card. There are 2 number on the stamp which might be the A#. One is the registration number (8 number long) and there is also a number written in red (again 8 number long). Any guidance is appreciated. Thanks.