My spouse did recieve fingerprint notice for 12/23/04 so we went in early to try our luck , i explained that i was the primary applicant and after they checked my Id and I485 notice the immigration officer printed something with my info on it and said that would serve as fingerprint notice and i was allowed to give fingerprint , the whole thing took less than 10 minutes. Many others have done the same on this forum and it worked for them.