Your description of the issue is correct.
Regarding your comment “The instructions from OF1 on how to merge archives may still apply to OF3,” I really would like to have a recipe that I know works. There is a question at that post, dated Aug 2015, asking “Can anyone confirm that the above does work on OF2 as well?”
I do wish that someone from the OmniGroup would give a lesson on how to merge archives, since failure to migrate the archive to a new machine is such an easy thing to do.
