"If you do not know or have reason to know based on readily accessible information the fair market value of your beneficial interest in the pension plan or deferred compensation plan on the last day of the year and you did not receive any distributions from the plan, the value of your interest in the plan is zero. In this circumstance, you should also use a value of zero for the plan in determining whether you have met your reporting threshold. If you have met the reporting threshold and are required to file Form 8938, you should report the plan and indicate that its maximum is zero"
Looking at the IRS Q&A, if you know or don't know the FMV, it's still the distributed amount that counts. Zero or otherwise.