one Other possible thing:
Refund from 2018 Federal taxes, you allowed the IRS to keep.....& had applied to 2019 taxes?
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IF not that:
Go to the Print Center..and save a PDF file of your taxes, but for your records, with ALL forms and worksheets.
In that PDF file will be a Federal "Tax Payments Worksheet" . That worksheet has a Federal columns with lines 1-20 that shows total Federal payments from all kinds of sources.....maybe the 500 will show up on one of those lines.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
