Why should you worry? Definitely the FOIPA request won't come back in time. Furthermore, the request for entry/exit should go to CBP not USCIS, so you might not get anything in the end
I wouldn't worry too much. Fill the information to the best of your knowledge in the N-400 and if you want to be completely worried about this you can mention at the interview that you filled it to the best of your knowledge based on information you were able to retrieve.