One thing you can do is if this was a DEDUCTIBLE traditional IRA contribution, take a look at line 19 on Schedule 1 (1040) and see if the amount you're thinking of is there, If so, you told TurboTax that you were making to contribution to traditional IRA.
If the amount is not there, then you either were making a non-deductible contribution to a traditional IRA, or to a Roth IRA.
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