You can see the status of your paper filed return on the IRS's 'Where's my Refund' page. Fanfare and xmasbaby0 are correct. Excerpt from this IRS link:
'Use this tool to check your refund. Your refund status will appear around:
- 24 hours after you e-file a current-year return
- 3 or 4 days after you e-file a prior-year return
- 4 weeks after you file a paper return'
With regards to your question about return-receipt, if you have not received the delivery receipt from USPS you can file PS Form 3811-A (Request for delivery information/Return Receipt) within 90 days of purchasing that service.
If you used a different delivery carrier, check with that carrier for their policies to track or verify a missing receipt.
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