I don't know how the IRS would react if you filed a duplicate 2009 Form 8606. I don't know if the IRS even retains your basis information from that long ago rather than just relying on the instruction for Form 8606 that says that you must retain copies of all Forms 8606 you have filed.
This reference might help:
https://www.irahelp.com/slottreport/tracking-basis-irs-form-8606
