I didn't test through AANP, I did mine through ANCC. In ANCC's case, there is a test score that comes with the letter that states that you passed the exam. However, the official wall certificate and wallet card that arrive later just state that you are board-certified. Employers, in my experience, only ask for the official certificate and would not even realize what the test score means as it is not even presented in a percentile score.
I passed ANCC in September. All I was told was that passed, both in person at the test center, and in the letter I got from them. In my experience, employers don't care what your score was; all they care about is the fact that you are certified.