The box contents info is up now. It doesn't appear on the page with all the search results but you can see it when you visit the page for the individual item.
Such as : Reiko's Lunia Database
The search page does have a link to the individual item pages anyway though just to make it stand out easier (you'll see what I mean)
It also works in reverse, since I'm sure someone some time would probably find this useful.
For example a catalyst can be found in 189 different boxes.
Reiko's Lunia Database
Next thing on the to do list is to fix up the set items search.