If you keep and the check, the IRS will ask for their money back at some point. I would suggest sending it back to the IRS with note explaining that you reported the missing payment in Turbo tax and expect a credit.
Please review this IRS link and read the section entitled When returning a paper check that was not cashed or deposited taxpayers should: In that section is an IRS link that will tell you the nearest IRS location to mail the check back to.
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