I've run mid-grade in mine in a pinch (near empty in a station that doesn't sell premium
) and not had a problem.
Like previous posts, what I'd be concerned about is general lack of care by this previous owner. Best case, even if you think they were trying to sell you on the idea that you don't need to run 93 (but they did), they're trying to snow you anyway. Either way sounds like it is questionable.
If you're concerned about the pedigree/care of a used Boxster in general, you might want to check your local PCA chapter's sale listings (or in Excellence magazine). In broad terms, the people that care enough to join an organization focused on the cars are more likely to maintain them properly, IMHO.
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