We don't know why the IRS wants to see your copy of the 1099R. Maybe you reported it on the wrong line or the withholding doesn't match what you reported.
#2 I think they want to see your actual 1099R to match the withholding you reported on your 1040. When you mail a return you have to attach all W2 and 1099 that show withholding on them. You could have a form that the payer hasn't sent in to the IRS yet.
