From an ops instructor standpoint, I can say that getting solid proof of the time you had as EWS/EOOW is very important when looking into the future. We review your record to verify the NRC required time to be eligible for SRO licensing. If the service record is wrong, we refer to your evaluations. If we can add up the months holding the qualification from the front of your eval to the required time, we will validate your eligibility in the ILT (Initial Licensing Training) class. If you don't have 24 months of acting EWS/EOOW, then you'll have to work your way up through experience and/or a degree. We are actually reviewing someone's evals (based on a FASA finding) because of inaccuracies in his service record.
I hope this helps!
Charlie