You need to search in the whole upload folder, not just the includes folder. If you did, you'd find it rendered in functions_bigthree.php (which does happen to be in the includes folder, so I don't know why it didn't show up when you searched).
There are articles on how to call custom templates over in the articles forums. You should check out those forums.
If you look up where the template is evaled, you'll see it's in a function and the results of that function are assigned to $post[onlinestatus].
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