I have an expunged record and nothing comes up on my FBI background check. However, do not ever underestimate what the BON can or cannot see. When I was in the situation of trying to figure out if I should disclose my record or not - I called the BON and the court house. I talked to quite a few people and it is just better to be safe than sorry. From what I was told, for people that are entering professions that deal with the public and there is a public safety concern - yes, if the BON wants to see your record, they absolutely can (sealed or expunged included). Whether or not the state you are in requires that you disclose that information just depends on that specific state, it seems like they are all different. Anyway, in WA state where I am at, I am required to disclose it. In WA if I do not disclose it and they find it, they have a right to deny me licensure forever in this state. Then, a denial is just a hassle and have to report that if I ever move to another state blah blah blah.
I put all required court documents together, an explanation letter, my transcripts, and two recommendation letters from clinical instructors. Oh, and why they want the court documents is because they can see any record but they can't see the details, just what you were charged with or the ending charge. So, the court documents give them some insight and along with your explanation letter, they can see what really happened during the event. Best of luck!