I apologize you did not receive a call back as promised, but I'm here to help.
Where did you purchase the wallpaper? Was it through the Play Store (Android Market)? Have you tried going to the main screen of the Play Store and selecting Menu and then going to My Apps. There you will find the apps previously purchased.
Let me know if this helps or if you were unable to find the wallpaper your looking for and I'll be happy to further assist you.
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