Quote:
Originally Posted by JSWolf
Here is a cover that shows it's a box set without being a really ugly angled box.

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And, in the example, the text isn't big enough to do people much good. Hardly anyone is seeing the cover at that size.
I've accidentally picked up a few in the past that had the font listed in small print that it was a boxed set, when the boxed set was actually listed in the SERIES list on amazon, as a separate book in the series.
Not only should boxed sets not be included in the series list, the single cover with small font doesn't catch the eye nor notify future buyers that it's a boxed set.
I think it's better to just make it plain, to cut down on accidental purchases and returns, than to worry about the cover. Fix it in Calibre and all's well.