In my case, only thing they asked me was,
"I never heard of this company, what do this company do ? "... it was it consultant...
my job responsibilities, and done. I do not know if they even look behind but in front of me, they didn't open the thick book full of documents .
My documents included (though).
paystub
tax
job offer letter validity,
h1 approval notice
vacation approval document
company tax documents.