I need a little bit more info to form an opinion on this. Your saying he has an .omf that he imported into Nuendo? and the automation he did in his editing software did not transcribe? If this is the case. There are some check boxes that need to be checked when importing said .omf, I will say that I have found in Nuendo importing any .omf i cannot rely on the volume automation from the editor. I have always had stray points that can throw your mix off.
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OMF is not the way you want to go. You're going from Nuendo to Nuendo, so you can just move the project file (with all the files involved).
So for this, I recommend going: File > Save Project To New Folder then pick a folder you want to save to and what I do is choose: Remove Unused Media, which gets rid of files in your pool that aren't actually being used. This way you minimize the size of the project when moving it around. This is GREAT for archiving.
If you choose Minimize Audio Files then it will trim the audio to only what you are using.
By doing it this way, all your plugin automations and all that (assuming they are on both systems) will remain the same.