You just need to mail the amended return and a check (if you're paying by check). Be sure to sign your tax returns, or they will return them to you. You don't have to "prove" anything to the IRS. You don't get a Form 1099-R for contributing to an IRA, that's what you get when you take a distribution from an IRA. You will get a Form 5498 that shows your contribution and balance in your IRA, but you rarely need those to complete your tax returns (they aren't sent out until after the filing deadline).
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