I would suggest to take W2 from last year. If it is his/her first H1B, then he/she also need to take school transcripts. First time they asked me why I didn't study UNIX while in college. With a surprise look, I asked him what is UNIX and he didn't bother to ask more Qs :=) And the last time the girl was wondering how far is my place from Santa Monica, CA. She was curious to know how far away I lived from her sister's place. Expect the unexpected............