Chol Hamoed. I believe they generally order from places that are not
kosher for pasech. My co-worker is not religious and does not keep
kosher, but he was concerned that there wouldn't be anything for him to
eat. He does not eat chametz on pesach. He doesn't necessarily keep
kosher during the holiday, in fact he told me one of his favorite pesach
foods growing up was matza, cream cheese and meat.
Very odd, but in my opinion it is better to keep Pesach wrong and at
least identify with your Jewishness then not to keep it at all.