You don't need to amend the return since you reported all of your gambling winnings. However, gambling winnings are usually reported on a Form 1099-G and since you didn't enter that on your tax return, the IRS will likely inquire about that at a later time. If that happens, you can explain what happened and that should resolve the issue. However, you can amend the return if you want even though your tax won't change. It may prevent the IRS from inquiring about the missing Form 1099-G entry.
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