BlackRock background check?

Nothing to hide but am curious to know about the BlackRock background check-I have heard it's extremely complicated. Particularly in light of recent legal change that makes it illegal to inquire about salary history. I wanted to incorporate my annual raise into my salary negotations for the role and that was info that I did not have at the time- I estimated and it came out slightly lower than expected but do not want BR to think I falsified my new salary information. Either way, my new salary won't be on my W2 and it takes effect in Oct.