A lawyer could possibly get a return copy from him with a letter, but that's up to you, and could take a while..
You can try to get a 2017 tax return transcript at the IRS website linked below. To download the transcript immediately, you have to qualify to open an IRS account, which has some questions you have to answer re: Identity, etc. If you can open the account, you can download a 2017 tax transcript. If you can't open the account, you can order one to come by mail, which takes 5-10 calendar days.
<a rel="nofollow" target="_blank" href="
https://www.irs.gov/individuals/get-transcript">https://www.irs.gov/individuals/get-transcript</a>
Keep watching the thread, and you may get additional suggestions from other forum users who see your thread..