I agree with the first part, but I'm not so sure about the last.
The records that Obama sealed are personal and private and, to the best of my knowledge, only a judge can order them unsealed if those records are believed to contain material evidence pertinent for a trial.
If we assume a Romney victory next week, I don't believe that Romney, or ANY POTUS, has the power to unseal zero's personal and private records. The only thing he can do is rescind the E.O.s that Obama has used to circumvent the Congress.
Those ‘seals’ requested by Obama in a court of law as a private person will require another lawsuit to unseal. Obama did that in Illinois in order to get elected as a state senator.
EO’s however are NOT court ordered seals but simple actions taken by a president for ‘National’ reasons even though the president had ‘Personal’ reasons for ordering them. A new EO by a new president based on ‘National’ reasons will be able to override older EO’s.