You will not have to repay any stimulus amounts received. The Recovery Rebate Credit on your 2020 tax return is reduced by any payments received in rounds one and/or two, but not below zero. The stimulus payments will not reduce your refund or increase your tax.
My suggestion, since you know the payment has been mailed, would be to claim the amount on your tax return as received and then initiate any tracer actions on the payment, if not actually received by the March date.
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