After speaking with TurboTax support over the phone, I am 98% confident that this is actually a very sophisticated scam letter. A couple of clues:
They used my maiden name, rather than my correct legal name.
They are requesting a generic set of forms, rather than something specific to my account as in other 12C letters.
They are requesting the returned information to a fax number that doesn't show up on any of the IRS websites. The fax number they (likely scammers) provided is [phone number removed]. (Please let me know if you are familiar with this number - I can't find it anywhere via Google search.)
My refund status according to the IRS is Pending, not Rejected.
I am going to keep trying to reach the IRS before faxing/mailing anything back, because sending my full return details to an unknown number is just too risky.
The letter also allows for info to be sent to this address; is this address familiar to anyone?
INTERNAL REVENUE SERVICE
Ogden Service Center
OGDEN, UT 84201
