My books also vanished from my purchasing history last week (the Connect-to-EBook Library upgrade didn't lose them on my local machine, though).
I sent a note to Sony customer service and got a non-sequiter response (looked like it was machine generated), but a day later all the books showed back up in my purchase history. Not sure if they fixed it for my account or it was just some general glitch that cleared up.
I'd recommend you drop Sony a note, KG, even though you've recovered the books locally. Having them in your purchase history is good disaster insurance (so you can re-download them).
Regards,
Bob
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