During a fingerprint background check for employment,what will the state police/fbi check show?

To whom ?

If this for just a private job, that is not related to any national security or law enforcement position, a sealed record is not suppose to show up, ( if it is done though the government records check)

If the record check after they check your ID by fingerprints, remember a fingerpring check merely proves who you are, then after they have checked your ID with fingerprints, a background check is done. A private search not done though government records, but private research firms, often show up records that the government sealed.

If this position is for a position that requires a national security clearance and a law enforcement position, then sealed records will still show.