In the end, I obtained another DX4000 device, deleted the contents of the Client Computer Backups directory and copied the recovered files from the failed DX4000 device onto that directory. The new DX4000 complained about errors in the database, I ran the fixup program and then was presented in the “Computers and Backup” section of the Dashboard with an “Archived Computer Backups” listing. Due to the quirks of the software, one cannot actually get a listing of the individual Archived Backups unless one re-connects the backed-up computer to the DX4000 device.
The CoveCube software discussed above is useful for getting a list of the computers in the database, in case you did want to reconnect them. In my case, I had gone ahead and setup yet another DX4000 and connected the computers to it.
In any case, kind of a Happy Ending, but lost of hoops to jump through.
