I appropriately disclosed an IA on my AMCAS application. On the ERAS application, I don't see anything explicitly asking about undergraduate IAs. Does this need to be visible somewhere in my application?
I had a friend who got an IA during undergrad and made it into med school. I don't think he is going to list it. IMO you are probably clear since you're already in med school. Legal stuff on the other hand is trickier.
My school has a 3 year period where they delete everything after that time relating to an IA. Your school might also have something similar. Also, if you call them and ask for the records, and they don't have them, you're probably in the clear.