Here is information on what the FATCA box is for: FATCA requires certain U.S. taxpayers who hold foreign financial assets with an aggregate value of more than the reporting threshold (at least $50,000) to report information about those assets on Form 8938, which must be attached to the taxpayer's annual income tax return.
If your 1099R states NO for the FATCA box, then the assumption would be that you are not required to file FATCA reporting, thus the assumption would be that the FATCA box is NOT checked.
