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This was going to be my question - for a 30 second thing if one of you is exporting a project at 25fps and the other is working at 30 then that might cause some kerfuffle to the tune of about 5 frames? Purely top of head but worth investigating.
Also complain to your ads department that there's a reason stuff gets outsourced etc : ) It was the same people you're dealing with now that used to do the outsourcing right? Maybe they're sabotaging it!
What is the video frame rate that everyone is working to?
and did you do the test where you load both their layback into a Nuendo project with your layback to compare them?