The purchase history system of the wapshop just sucks... it often purges things from the list after a month of purchase. It's still in their records, and likely in yours too depending on what method of payment you used, but they're largely relying on you to keep your APK backed up. Sacred Odyssey's still in your purchase history, you just can't see it from that page.
If they're gonna be so resistant to move ALL their games to the official Android market, they need to at least make an Amazon Appstore style app that you can log in to, purchase games, view trophies, read/reply to messages/friend requests and view complete purchase history.
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