As BillM223 has already said, we have no way of knowing if these were from pre-tax or post-tax contributions. You would need a statement of fact from the plan's administrator in order to know for sure if pre-tax or post-tax. At this juncture, we could not advise you one way or another on how to prove to the IRS that this is post tax. You would need a statement of fact to keep with your tax return in case if the IRS inquires about the credit. Just remember in order to claim, the payment must be made from post-tax dollars.
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