Things went swimmingly well, until a user reported seeing an error message, and then not being able to access the document at all. Escalation was a joke, and after a whole week of not having access to the critical google spreadsheet, Google was still fumbling around. Finally we got the document back, because one of the employees had kept the email containing the URL of the document (sent out when a document is shared with a group of people).
If it wasn't for that old email kept by an employee, we'd probably never would have 'found' the document again. Google's support was at best incompetent.
Beware dancing with the Dragon that is Google! Backup your files, keep important document URLS!
Hope this helps a poor soul somewhere.