Recovering data after massive deletions

Due to a faulty keyboard, an `x' was sent repeatedly to the
terminal with a file open in vim.
The large file was reduced to a few lines as a result.

I have salvaged some data from backups and the screen buffer. I
thought that I could recover the balance from vim's undo
buffer. However, I am not able to access more data through g- and g+.
They report "You are already at the earliest/latest version"
respectively."

Also this message;
Swap file ".guys.swp" already exists! "guys" 4L, 70C E825: Corrupted undo file (num_head): /home/ eric/.guys.un~

And when executing undotree(), this alert;
E731: using Dictionary as a String

Is there anything worth trying to recover data before giving up?

--
Eric Smith

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