Knowing all the IRS failed audits, this sounds like a very real possibility.
Discussion
I can imagine some low-level employee looking around the office for a thumb-drive to take some work home, and mindlessly taking the drive with all the keys, and formatting it.
That would be a good plot for an action movie or comedy.
Oh no! We setup a single-sig wallet to hold our $5 billion bitcoin reserve, and now we can't find where we stored the key! Starring Martin Lawrence and Mr. Bean!
And then the employee who stole the key turns out to owe a massive debt to a drug cartel and uses the keys to pay off the debt.