Please read my standard disclaimer above.
Oh, the last thing the IRS wants to do is to pur someone in jail for a honest mistake. We'll bend over backwards to help someone, even if the honest mistake is in the tens of thousands of dollars. Yes, there are taxpayers who underreport their income or overstate their deductions by that much, and we still don't even think about criminal penalties for them. We may ding them for civil penalties. But we would never prosecute, unless the taxpayer knew what he was doing was wrong, and the money amounts are huge.
I'll second that. I'd call first, so that the representative can notate in our computer system that you called and that you are sending the information. But I would back everything up in writing. We (as phone representatives) are supposed to document every phone call in our servicewide computer system. However, sometimes we forget. You may call at the end of our shift, we are in a hurry to get home, think that we would document it first thing in the morning but we forget. Or once, a computer failure knocked us completely out of a system while I was documenting a phone conversation. I forgot to write down the access number to get back into her account, so her conversation was undocumented.
One other thing, when corresponding to the IRS. Do not send originals. Send photocopies. Sometimes documents are misrouted, and you may have to send the same document two or even three times. Also, if you are able to fax the documents, do so. That saves a lot of time. However, do so if you can do it cheaply (e.g. if you can fax it from work, or you have a home fax machine). Do not go to Kinkos and spend $3 a page faxing it.