Logic Pro X Opening Logic 7 Projects


I've got a client who is trying to open Logic 7 songs from 2005 or 2006 in 10.4.6, but he says they don't find the audio files in the Audio Files folder, even after a search. Problem is he has moved away so I can't help him in person, and I'm not sure what to tell him. Is there some basic process to re-connecting the elements of these old .lso's and opening them properly in Logic Pro?