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Sounds like they want a copy of the 1099-R that you entered onto the return. 

https://www.irs.gov/individuals/understanding-your-cp05a-notice

 

What this notice is about

We need information before we can send a refund.


What you need to do

  • Send us copies of the items listed on the notice so we can verify your income and income tax withholding.
     
  • Attach your documents to the notice contact stub.
     
  • Send your response within 30 days from the date of the notice by:
     
    • Faxing your documents to the fax number in the notice using either a fax machine or an online fax service. Protect yourself when sending digital data by understanding the fax service’s privacy and security policies, or
    • Mailing your response to the address shown on the stub.