If you paper filed and did not include all W-2's and 1099 forms that had Federal tax withholding as required, then DO NOT sent them now.
The IRS will mail a letter requesting the missing forms with a case number and the address to mail to. If you mail, they will never be matched with your tax return.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**