Some Pictures Not Migrating With Move To New Computer

Hi There,
I have tried a few times to migrate our web site to a new Mac from version 3.6.7 to version 5.4.1 then to version 6.3.7
Although most pictures appear to be in their folders (page 15 Files Folder etc) they are not showing up when I preview the web site offline, so I am hesitant to try to publish the site.
I think I have followed the upgrade instructions correctly…
I downloaded the previous site and I have been considering just placing the pictures in their respective folders, (after publishing with Rapidweaver 6) but with the version changes I’m just not sure that will work.
Any Help would be Great.