I had to file my taxes by mail this year. I sent my taxes on time. Actually, a couple of months early. The envelope included my check and all documents. The check was cashed, but now I received a CP80 form stating that they have my money and I have a credit on my account, but that I need to send my tax return. Should I mark the forms sent the second time in any way so that it shows that I filed on time and was not late? Also, since I already sent them, can I send a copy of my W2 since I do not have an extra? The IRS is not answering the phone for the last few days.
