What do you mean by "the unit's wallpaper"?
The Pandigital Launcher has no wallpaper -- just the OEM start page screen with the "bookstore", "my library", and "application quick launch bar".
If you were using a different launcher -- stock Android, or Panda Home, or Launcher Pro, for example -- the wallpaper is, I believe, not kept in a seperate folder that would be recoverable. They are built into the .apk and should be available when you re-install the launcher.
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