Since I'm helping my cuz over the phone:

i821
pg 2
q. 4 Alien Registration number.

Is this a number given to certain types of visas or all visas? She crossed using a b1/b2 border crossing visa

i821
pg 3
q. 6 proof of leaves and returns

C'mon, what if the person in question used the visa a bunch of times and has no records? Will an affidavit work? Can she ask immigration for those records? (they scanned the thing all the time). Circumstantial evidence (as in look at the transcripts).

i821
pg 4
q. 1 You ever been convicted of.....

The ditz shoplifted something as a minor. She was booked and prints taken, never had a court appearance, only a panel that expunged her record. Does this mean she was never convicted of a misdemeanor? The person in charge of the hearing told her she could under oath tell the courts that she had never committed any crime w/o committing perjury.