Lost Windows Server Backup, historical backups. Backup seems to have restarted from a fresh full backup. How can I get to those old backups?

Scenario with very bad outlook:
Friday-16th, early AM.  Win2008 SBS Server crashes due to RAID5 issues, bad disk.  Found that server was NOT configured with hot spare and for some reason the controller had marked a 2nd disk bad..which turned out not to be the case.
Had a single external USB backup drive being fed by Windows Server Backup.  Obtained support from vendor and was able to regain the RAID and start the server. 
Soon became apparent that Exchange was having serious issues - edb was corrupt and not mountable.  Restore edb from backup, repaired and was eventually able to mount.  Then found it had Hub Transport issues.  Researching that when it was noticed
NTFS events being logged at a high rate.  Restarted system to repair the filesystem, which was successful.
After the FS repair, found the Exchange edb, new edb I had created to migrate mailboxes to, and public edb all 0k in size.
Restored the edb again and commenced repair, which eventually read Clean Shutdown again...but could not get it to mount.  Exchange was having various issues seemingly with AD.
Changed backup time to avoid a backup that day, as did not want to back up while RAID was rebuilding - had inserted a replacement for the failed drive.
Monday/19th, was advised that much of the data was corrupt.  This is an accounting firm and relies heavily on their data, especially since the last time their ext USB was rotated was Nov6 2013.  They now have no year end backup, nor a backup from
post tax season 2014.
Is it possible to recover any of the historical backups prior to the full backup/restart?
Oh, and all Shadow Copies for the impacted volume/drive are gone.
Thank you.

Hi,
Please use the “Wbadmin get versions” command to check the backup versions on the server. If there is only latest shadow copy, you may not recover any of the historical backups prior to the full backup.
Backup Version and Space Management in Windows Server Backup
http://blogs.technet.com/b/filecab/archive/2009/06/22/backup-version-and-space-management-in-windows-server-backup.aspx
Regards,
Mandy
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