Keep them with your tax file.
The IRS gets a copy of their own, they don't need a copy of yours.
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You save them in a labeled 2020 tax folder, and save with all your other tax documents....and a print-out of your 2020 tax forms.
...... the IRS or the State tax department may ask for copies of them at any time in the next 3-to7 (or so) years IF...if they decide to check on what you entered on your tax forms.....or if they randomly decide to audit you.