You can order Wage and Income transcript from the IRS. This is not a copy of a return, but it reports data from information returns the IRS receives such as Forms W-2, 1099, 1098 and Form 5498, and IRA Contribution Information. This transcript type can go back 10 years.
Taxpayers often use the information from transcripts to file prior year returns, when the original paperwork is lost. The transcripts are free and with luck, you can get them online.
Please look at the IRS website for Transcripts at https://www.irs.gov/individuals/get-transcript .
NOTE: at the moment, the IRS has announced that they are not doing transcripts by mail, so try your best to get it using the online process.