@kris-jeffers
Please explain exactly what you are trying to find? What exactly is the IRS asking for? Proof of paying taxes would be your bank statement, cancelled check, credit/debit card statement, etc.
TurboTax free Audit Support Center can help you with how to respond to an IRS letter/demand.
Click the blue "Get Help" button at this page and follow the prompts to get the phone number:
https://support.turbotax.intuit.com/irs-notice/audit-support/
