If you give them copies of your score reports to show you passed, then yes, they'd know. If you show them in some other way that you have credit for the exams, then they wouldn't know. My state mailed a letter after the exams stating that you'd passed and it showed at the top each part and whether you had credit for it or not and when the credit expired, so had I used that letter to demonstrate completion, they would have at most seen the score for my last section, or I could've just shown them the top which showed no scores. I've heard that for NASBA states, there's usually a screen that shows credit status for all your exams, so I'd think you could print that out to show to employers.
That being said, if you continue to get scores like the one you got on FAR, I'd think you'd be proud to show that score to your employer, in which case you could show scores as proof of passing rather than just the “Credit”/”No Credit” screen.