Mail Crashed - Inbox Deleted - Trying Data Recovery - Help

Question

I am running a G4 Powerbook 10.3.9 and Mail 1.3.11 locked up and crashed. My old Inbox is wiped out. Last July, I accidentally deleted my Sent emails but that was intentional (as in I thought I was in the Trash window, selected All and Deleted but as I was in my Sent window, that's what got deleted). I bought Data Rescue II and was able to restore almost all of my deleted Sent email.
So I tried to do the same today. I recovered large "mail" files to the CBR folder. These files are marked as Mail-00034.mbox where the number goes up. Some files are 100MB while others are smaller. I also recovered the INBOX.mbox file but I cannot import either file type into Mail (as in the Import Mailbox function).
I have recovered plenty of big files but none that can be imported into mail. Any thoughts. Thanks in advance

Answer 1

The current INBOX.mbox contents include
content_index 128K
Info.plist 4K
mbox 236K
mbox.SKindex 30.3MB
mbox.SKindex.isValid 0K
tableofcontents 4K
The file size of the mbox.SKindex does not make complete sense as I have only about a dozen or so emails currently in my INBOX (those received after the crash). Either way, the entire INBOX file is way too small (compared with a 1.2G SENT box). I believe the INBOX file size was around 900MB prior to the crash.
As for what the Data Recovery II program found, it recovered a folder called CBR and in it is a folder called Mail, and in that a folder called AppleMail, and in that about 120 files (using the mailbox icon) all labeled "Mail-######.mbox" where the ###### refers to 00001 (the first file) up to 00120 (the last file). File sizes vary from several at 100MB down to 1MB. There is a great deal of data there. When I try and import these files into Mail, the import seems to work but the IMPORT folder is empty.
Data Recovery also got a INBOX.mbox file that when opened, is blank. It too reads as 30.3MB (vs. the 30.7MB INBOX.mbox file noted above). When this is opened, there are 0 emails in it.