Search box within search results question

[TheaterMania]

I work for a Theater news website. We have two sister sites, theatermania.com in the US and whatsonstage.com in London.

Both sites have largely the same codebase and page layouts. We've implemented markup that allows google to show a search box for our site in its results page.

For some reason, the search box is showing for one site but not the other: http://screencast.com/t/CSA62NT8

We're scratching our heads. Does anyone have any ideas?

[Lumina]

Depending on how long ago it was that you added the search box feature, it could very well be that Google's recently swept one site but not the other. As that's something more or less out of your control, I suggest looking through the code for the in-SERP search box and making sure that it's 100% accurate.

Other than these things, I can't think of any reason why the search box wouldn't be on one but the other.

Hope that helps!