TurboTax does not keep old copies of documents, certainly not from 2018.
I assume by W-2. you mean your tax return from 2018, right?
The cheapest thing for you to do is to get a transcript of your 2018 tax return from the IRS. Go to Get Transcript. You want to try to get the Transcript online, so read all the instructions. Generally, the IRS will ask you things from your credit report to confirm your identity.
Since you want a transcript that is more than 3 years old, you will have to ask for the Tax Account Transcript.
This should show anyone that you filed a return in 2018, since the source of this information is the IRS itself.
Alternatively, if you don't mind paying a fee, you can get an exact copy of your tax return from 2018. Read the instructions at About Form 4506, Request for Copy of Tax Return
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