Here is the passage again:
Raja knew that his roommate Tina had cupcakes hidden in the apartment. He
looked everywhere. Including in the clothes hamper,
on top of the bookcases, behind the sofa—even under his own bed!—all to
no avail.
The third part is an afterthought fragment. This part lists some good details but does not include a main clause, the one essential element in every complete sentence.