Taxpayers can call the IRS directly and ask that W2 or 1099 information and any other information reported - be mailed to them.
However, you will need to contact your state tax agency to secure the state withholding amount, if any.
Taxpayers who would rather not speak to the IRS directly, can seek the help of an online tax resolution service for past due returns, such as http://taxeswilltravel.com/pdr.htm
For clarification of tax codes, visit irs.gov