I do see where it could become problematic. Maybe explain to them that the FCC went to FRN to eliminate the SSN? (I think security was one of the reasons?). You are basically taking a government record (SSN) from one government agency to the other and if done correctly, no one but the government will actually see the SSN? Then you can argue the USPS and FCC are independent agencies...whatever that means...it has come up a few times (hey...I teach the G/T kids so we wind up waaaaaaay off track sometimes...)