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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This wallpaper, along with other wallpapers that disappeared, came with my Samsung Charge phone. I checked the Play Store and didn't find it.
just a guess.....but it was likely part of samsung's own skin (user interface) and if they didn't include it with the update, then i doubt you'l find it. i may be wrong.