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Ebooks have only been a serious marketable product for a few years possibly less than 10 years. Has mobi, epub, bbeb even been around that long? I wouldn't expect any publisher to have a nicely ebook formatted digital file of anything published before 2005.
I don't know the average length of a publishing contract but it's not forever. As Elfwreck said why keep archives of products you no longer have the right to own. If you can't reprint it or release it, then you'll spend as little as possible on it's preservation.
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